Really nice!
I really liked this game, it's very challenging and really balanced. The graphics are wonderfull, i love the pixelalted art, and the controls and gameplay was bugfree and really easy to use.
The powerups helped alot, but they didn't kill the challenge, which i really liked about the game, but maybe you should make a difficulty selecter, cus i found myself stuck, trying to get the second red-block. Also, eventhough it's okay that it's hard and challenging, don't make instakills when getting stuck between 2 fireballs.
Generally a really really good game, and with a few minor tweaks, it could score many prizes. 9/10 and 4/5. Great job.