Was the voice acting done by professionals? Well done LOL
Art is great and gameplay is solid! I'll offer one critique though:
Gameplay has some good ideas but it feels limited by the lack of recoil/lag time on the gun. The optimal strategy to me seemed like it was just to rapid click. I feel like the colored bullets was a super cool idea and I think some recoil on gunshots would make me more carefully think about where I'm placing my bullets.