A few suggestions.
Just had to log in and review this one. I really like, the grades i gave to all the stuff like Graphics, Style, etc dont really matter, cause a game like this is way beyond those attributes. This game is about addiction, and believe me, i spent my finest 20 mins (on newgrounds ofc, i do better on other things ^^) playing this game. The only real suggestiong i got give, is to make it a) bigger or b) harder. I really expected more from the last levels, werent that hard, and really should be, so i could spent hours and hours thinking on how to beat it.
You could make us spend lives whenever we blast, and whenever a life is lost we couldnt try that level again until we have enough credits for it (credits would come from passing other levels, higher levels would give more credits) I dont know really, not the expert here. But really, consider making a second one, a harder one, a longer one.
Keep up the great work mate ;)