The game tells you that this is not an action shooter and even punishes the player for reckless actions at times. So you have to play stealthily, right? Well, the level design is very bad if you consider this a stealth game. In half the levels, it is impossible to kill one NPC without being spotted by another NPC. When this is done intentionally, it is done well, but most of the time it is done unintentionally, which is just terrible. Be prepared for NPCs to jump out of the sky at you without giving you a second to react, or to be attacked from both sides by enemies you can’t even see. The most obvious example of bad level design is level 11. Almost every enemy is being watched by another NPC you can’t even see. There are various boxes throughout the level that serve to prevent this, but NPCs simply climb over them or push them away. Even characters with increased stealth are not always safe from a sudden paratrooper with a shotgun. One simple way I could come up with to solve this problem is to make NPCs not notice you until they appear on your screen.
P.s. I know the levels in the new version are not polished, but there were examples of bad level design before the update too. The most obvious one is the zigzag (especially that moment when you go out on the roof).
P.s.2 It's quite strange when people call me "bad at the game" after I've completed the levels I mentioned on X rank. You should stop doing this, it makes you look bad.