The games could use more sound effects and music for things like the player getting hit or jumping, the art is great but the bullet might want a remodel XD, and some particle effects for things like the right click or the gun where you push back enemies or enemies dying, the lighting also needs fixing since it looks so out of place, the gameplay was fine only wish it to be faster like lowering the enemies health or something like that, the explanation was a bit hard to understand, maybe use more common words or an example, the UI is also not properly reset once you died, maybe a main menu or a setting to change you mouse sensitivity since I keep missing my shot.
Good job it was fun :D