Not bad...not bad at all :)
But there's 2 small things:
1) ***BUG REPORT*** in the help section, at the last page ( RULES OF PLAY ) it says the RED QUARKS are the GOOD ones, and the PURLE QUARKS are the BAD ones, would be handy if you'd correct that :)
2) You need music. Seriously. I'd give it a 9 or even a 10 if it'd just have some addictive backgroundmusic where you can listen all day to without being annoyed.
Overal it's a good game, no annoying delay with stopping unlike the similar games, powerups are good, speed is good, and ofcourse the grafix are good :)
Keep making games, you got talent :D