I thought it was a nice game. I like the art style for sure. The controls were mostly good. The level of progression from super easy to a bit of a challenge was decent. Once you have the automatic gun with 750 bullets it's over though. I wouldn't make it much more difficult but maybe a little bit...
Nice to be able to choose your own costume, though not needed - it was fun.
Gameplay overall was a 3* but I happen to like your style of art, I hope you continue to make more games in the future.
The music was average.