Ahh, so wonderfully addictive! Excellent song selection, innovative controls, and a difficulty that keeps you playing for hours for that perfect that you know you can get, this next time...
On upgrading. your goal should be to survive until you have enough points for overkill and the laser cannon. Using the two combined, one can gain over 50000 xp per round.
Having the ability to move and restore health would greatly increase my enjoyment of the game. Also, if the colors were restored pixel by pixel while the player is playing, that would be really exciting.
Yeah, so this is definitely a waste of space. Does Kongregate have some method in place to get rid of games like this? If they don't here is your reason why they need one.