Here's what I think
Gameplay: Good. It had me playing till i died....but I think 1 life is kinda harsh seeing as you can't recover until you obtain the green power up and you dont get that till like the 6th level and even then it doesn't get obtained fast. Powerups take wayyyyy to long to get obtained.... I also think that you shoud really get more than one life.
There should also be another kind of pixel that if it hits you On the lenz it will heal you. It wont increase any bar just heal you.
There should also be a rainbow ball that appears that will increase all of the bars by 1 (only from the bars that you have though.)
That's just what i think. and heres supah 5 for ya