I can understand there's a lot of frustration in here. I think a lot of what's happening is early development + lackluster features. You really raise some good points though.
Regarding weapons, you're right. A lot of balance elements are poor, and need to be reined in. The recoil is all over the place after the animation overhaul, but I hear you. Oh, and the bolt action rifle's firing is a poorly programmed quality of life behaviour (believe it or not) that's not working as intended.
I don't like where the AI's at either. Tbh the Enemy AI itself is actually not even complete. That's why they go from a relatively harmless state to unloading on you. That's a big next milestone I hope to work on, so I hope you'll see it in a future DD.
Games missing even minor features like Mouse Sensitivity and Resolution settings (or settings in general) are super frustrating, so that's definitely something I'll be adding in time.
Hopefully you'll check the game out again sometime, and the game will give a clearer direction in what to do for the demo. For now it's barely a showcase of some super rough development.
But anyway, thanks for playing! I really appreciate it.