Cute graphic design. Reminds me of bitsy!
The controls are smooth, and the guns are responsive. Each gun handles differently, and some of them are hilarious (Dolla???).
I explored the whole level, but I was not able to "finish" the game. I'm not sure if I missed anything.
Also, look into adding music and SFX. A little bit of effort can go a long way in terms of making the game experience deeper.