My biggest complaint with the game is that's it's too simple.

Specifically with the survival mechincs. I wish it was a bit more complex when it came to fixing your weapons or managing relationships with the factions. There is a rest requirement in the game but you never actually need to sleep. The loot pool is so small the only real resources are ammo and money everything else is so abundant you really don't even need to care about it. Adding more items you could use to maintain your weapons so you wouldn't need to spend as much money on them would be neat.

One more thing adding some kind of save system would be awesome for immersion like you can only save near a fire or when you sleep or something of that nature. I really enjoyed gammas system where you would need a lit fire to save so you needed to remember to carry matches. More resources I actually need to care about would go a long way.