-Nice music
-Very nice main menu
-shotgun and SMG have a nice feeling, Carbine seems underpowered, lacking a scope, smaller levels favor faster weapons
-Letting go of crouch under the barrier made me get stuck
-Neat reloading animation with the shells flying off(boltgun inspired?)
-I think there's an input buffer which if you shoot while reloading, the shot releases after you're done reloading. I don't like that.
Jumping and shooting makes the gun shoot way off at the ceiling. I suggest resetting aim instantly if the user shoots(also from sprint). try to remember games where you enjoy jump shooting around corners, COD, Max Payne etc
After getting demolished instantly by red shotgunners a few times I'm putting it down
I went near a door, the enemy instantly went at me from ambush, I shot a bunch while retreating but died right away. (I had the SMG)
Those enemies in particular are a bit too strong. Their design being placed in tighter places is almost like a precision platformer putting Gotcha moments where you have to get hit to learn the level.
The thing is.. shooters levels aren't typically replayed to perfection until you learn every enemy's location.
Still, the core experience is enjoyable, good job.