Nice game. Just a few points of criticism:

-It was really short. Which is fine, because it was for a contest.
-I really had no idea what color killed what. But that's because I don't know jack diddly about colors. xD Maybe adding a color wheel to help people like me?
-Some of the later levels were a little 'too' easy. Like, literally, one of them was just a straight walk through.
-I saw some buffed up enemies, and never even got to shoot any of them! I was sad ;-;

On the bright side, the music is pretty sick, the controls worked pretty well, and I was able to finish the game all the way through. Just those things I mentioned were my issues with it. All in all pretty good!

i liked this lil game, its a simple idea and not hard to really learn and play. It has a cool game mechanic and i think has potential to be something more if your interested in adding to this game. I do have some ideas and advice to make this a better project so please dont get angry or anything, because playing this i thought of some cool ideas to add. First of all it gets really hard in the second level in the fact that in one hit you die and have to start all over. You should either add some sort of life meter, or when you die save the progress of what enemies you already killed. Add a score system as well that will up the replay value. I liked the "spy" "hero" like music tho it really went well with the player and how he's holding the gun. I do have a complaint about the contrasting of colors. There was to many oranges and reds and the colors look VERY close together and it was hard to figure out what was what with the enemies. I would also maybe change the color scheme of each level so it shows some variations instead of everything looking the same. But overall its a cool fast lil game and if I were you, I would add more to this and it would be a pretty good game!

A very nice idea, good job. Although the graphics and some interface needed work on, it's a pretty decent platformer. I did get annoyed sometimes about how the player would walk a big step when tapping the walk key, as sometimes I would overshoot single blocks quickly.