Yes, over 200 years there a lot of radiation left, but food and water should not kill after 30 days. Their dosage must be less than 0.000001 and such a value has no sense in the game.

To compensate these changes, player character has increased chance to get a desease. Swimming in dirty waters causes deseases. Don't rush telling that this is pointless, because antibiotics are very rare now. Plus, almost all prewar food also may be a cause of deseases.

People who sell to you things are not factories!

Based on what tells you Cait there should not be a thing as it was done in the vanilla game. Yes, you will have to return back to doctors. Too bad that the machine is not working for you (good idea for a mod, eh?).

To satisfy your curiosity, now addictol gives you a temporary cure of all addictions for a limited period of time. Using any chem under addictol would break its effect.

Stimpack heals over time (as expected). NPCs heals themselves with Stimpack also over time. You heal your companions on the ground up to maximum. This is vanilla scripted event, which hard for any changes.

Psycho effect has been changed according to original Fallout 1 canon. See details here.

Med-X is working like a bandage than a chem. Probably it should heal broken limbs for a limited amount of time, but technically, it's hard to implement without breaking something else. Perhaps, I will change it later.

If your combat skills are very high, then, probably, the confortable level would be around 30-50.

With unlevelled everything system, you will see all types of enemies and all equipment starting right from the begining. It would be a normal to run or avoid encounters until the moment when you would felt that your rambo has born.

Player character (human race): 40 (race) + 40 (base) + 5 * END. Life Giver Perk: 2 * 20 HP.
Human NPCs have Health around 80-130 HP, some bosses around 180 HP (like under Buffout).
Ghouls have additional +40 HP race bonus, e.g. 120-170 HP.
Behemoths (including Swan) ~ 750 HP.
SuperMutants ~ 160-300HP.
Deathclaws ~ 500-650 HP.
Vertibirds ~1000-2000 HP.

So, while this mod is using unlevelled everything system you must expect to meet such enemies at any level at any time. See also next question.

Critical hits work outside VATS and normal shots inside VATS also do critical hits.
Player character have 1% * Luck bonus instantly. Plus, there are perks to improve it.
Also, the mod expects that you will pay attention to critical damage bonus.

There are no plans to add critical hits to NPCs at the moment.

No changes to Body Parts at the moment. Sometimes I want to increase headshot bonus, but there are critical hits... I still in doubt.

Currently, stealth system is like as in the vanilla game. I did not nerfed "running while sneaking" perk, except this perk is last now (5th of 5). Still you can install any stealth overhaul mod for your taste.

Weapons with explosion effect are changed to be more deadly, like it was done in Fallout 1/2.

Damage of Energy weapons buffed up according to Fallout 1/2 canon.

Alien Blaster now only one and unique weapon with Electrical type of damage as it was done in Fallout 1.

There are no double damage Perks at all and you should pay attention to 3rd party mods, because some of them are excepting that all weapons deal 2x base damage like in the vanilla game.

As said above the damage from explosions buffed up. Meanwhile, the armor mods (Padded and Dense) also changed for you, so you could survive.

Flamer and Cryolator (also in hands Police Protectrons) are deadly weapons, because there almost no Cryo (Fire) resistances. Power Armor have 50% protection against Cryo & Fire damages silently for you and NPCs. Also, Fire & Cryo damages do not working against robots.

Molotov's coctails may cause fear on foes. Asbestos Lining armor mod provides defense against them.

Do you tired from Bethesda's mini-games? I do. There is no minigames for Lockpicking (except one case). Terminal minigames are smart to give a purpose for Mentats and other +INT items (there are 3 checks against INT: 3+, 6+ and 9+).

Auto-unlocking for locks and terminals based on skills (AGI, INT, LUCK) and takes into account perks (Hacker, Locksmith) + perks from companions (Valentine) + read magazines.

Auto-unlocking terminal does not cause terminal lock off, because this function is hidden and hardcoded. May be I'll made some workaround for it.

You may disable auto-unlocking via Settings holotape at any time. Be ware that minigames have been changed to be harder and a patch required to turn them back as they done in the vanilla game.

Legendary item spawn rate has been greatly descreased. Instead of changing spawn rate of legendary enemies, Oldy contains changes when (and what kind of) an legendary item could be spawned. Only creatures that logically could handle legendary items will have them. Doing this the spawn rate descreased about 80%, so you will be glad to see any legendary item at all.

Currently, only a human could have any kind of legendary item. There are restrictions for Aliens, SuperMutants and Synths.

To compensate this, a legendary item could be spawned in boss containers. The chance is very low and it depends on your Luck and Scrounger Perk.

Radiation from almost all food was removed, but most food cause diseases now. Only cooked and preserved packaged food are considered safe.

All drinks quenches thirsty, even alcohol. Steaks are increasing carry weight, meantime, soups are increasing action point recovery speed.

Some sorts of alcohol are increasing Health. This was done for those of us, who avoid using any chems (there are a few situations where your Health is not enough no matter how fast you shooting).

Starting as 0.1.2 you can wash food from flora at any cooking station (no water needed). To reverse, just drop a food on the ground.

The mod was not intended to be a very hard or difficult. It could be difficult only in the begining. Actually, in some moments it even easer than you might think.

More than that, top tier weapons are considered be normal neither most people think about when talking about the vanilla game. For instance, Gatling Laser is not just OP: meanwhile it is OP in your hands, it is also OP to killing you. This is the difference between Oldy and the vanilla game.

The general advice for dogfights is using all available equipment when getting trouble. It could be grenades, heavy weapons, chems, booze, mines. These items intended to be used, neither sold or puted in and being forgotten in your house.

Amount of most loot decreased. Loot of some quests were also changed.
Amount of food & water increased (due the fact that Raiders are also humans).

Prices of most items (except food) were not affected. Some overhauls are intended to limit you being welth. On other hand, the main goal in Oldy is allow you to spend caps on everything. Probably, you will find for yourself that you will buying items that you have never bought previously.

Loot in safes now meaningful. Again, it allows you spend caps and also prevents wasting your time on scavenging junk. Another plus of such decision, it will be more attractive to explore world for looking these safes.

Bad side of Oldy in this question, it is limiting of getting good items. Everything is a random (this is intended, if something is not like described it will be fixed soon). All items in shops now random. Amount of weapons, ammo and armors also have been decreased.

First thing first, there are no double damage perks. The mod balanced for base weapon damages and you should pay attention for 3rd party mods, because some of them were intended to be used with 2x damage of weapons as it done in the vanilla game.

Almost all perks were remade and Oldy trying to avoid repeating perks with similar effects (e.g. +5% stagger, +10% stagger, etc) as much as it possible.

Some perks were significally buffed up, for instance, Intimidation now works 100% of time (no random checks). Such changes usually made for perks with very high requirements. While you may think you can spam it and the game became very easy, don't. Due the fact that you have much less HP, you would probably die before than you would try to use the perk again, while being attacked by multiple foes.

Also, the mod was inspired by Fallout 1/2 and Fallout New Vegas perks. Some of them are done in the form of magazine perks, for instance, Rad Child.

Perk effects of Compainions were nerfed down. There is no need to rush doing compainion's quests to gain them as was done in the vanilla game.