The art is simple and very good, bringing the MS Paint vibe. I liked the bazooka cat sprite a lot! =D

The music is great and combining with the art, and the sound effects are good too.

The levels are very good, I liked the type of enemies and the challenges!
Sometimes I got surprised by the enemy who comes bouncing just after entering a room. Perhaps it could have a delay time before start moving.

The commands are good, but sometimes I confused the K button with the J button.
If I press the fire button too fast, the player stops firing, and only starts to shoot again when I turn to the other direction, throwing at the same time all the shots that should have come out.

Congratulations for the game, it's very good!! I had a lot of fun playing it!

I liked the graphics and the implication that bazooka cats are a regular, abeit annoying, occurrence. Like HexGridLife said, hit detection is poor. I ended up just running past them and then I ran into a spider and died.

Fix the hit detection and you've got a cute little game.