very creative use of the theme, and i truly love the visuals. i didn't have any performance issues past the initial loading you warn about when booting up the game. also, i think movement feels very responsive and satisfactory, as does the shooting (though i do think you could have used a more pleasant sound effect for the shotgun and it would have made it all the more appealing to blast those trash bags!)
level design was good in my opinion, the last level being the only one i didn't enjoy.
the music was very good, although i think it could have looped a bit better, because i could tell when the song was restarting, and that can be a bit distracting (at least for me), but a very cool song nevertheless.
overall, i think it's a very good game, and the best thing is that from what i read in the game's page, you already know what to improve for your next game, so that's really cool for you.