In the stealth genre of games you are generally supposed to be more rewarded by playing the stealth mode and interacting with the stealth mechanics than just going guns blazing through the whole facility. It’s very easy to just go guns blazing in this game and treat it like a classic 2d shooter though. On top of that, you are actually rewarded for doing that at the end because you have less enemies to deal with. Even with the mutations, the enemy AI is just too dumb to have an effect. If you are trying to build a stealth game, make the player interact with the stealth mechanics. If you are trying to make a shooter, just add more shooter mechanics and remove the stealth ones.