Okay...
...you want suggestions, I've give them to you. But first, here are the details on scoring.
Graphics-Very nice, of great quality. Don't see any problem.
Sound-Good song for the game, maybe a couple others (like 2 or 3 more songs)?
Style-Here's where the review is gonna get long.
-First of all, in itself, the game concept was decent. Take out certain flashed that are red, protect the good ones. But the leveling system was boring. How about this...
The leveling system is like that of the protect/blam badges on Newgrounds. Follow the Newgrounds Blam/Protect system, and put the badge icon for whatever level you're on towards the bottom left corner, that would be cool. Also remember to make it harder for each level go up.
Every five levels, put in a boss that you can destroy by waving your mouse over it.
A health system would work nicely with the score. If you take out a normal flash, you lose points AND lose health, but if you take out a blue one, you lose more points AND health than that for a normal flash. For every 50-100 (or so) flashes that you blam successfully, you earn some health back.
The game also seems to be slightly linear. You're only playing on one direction. Make the screensize slightly bigger, and make it so flashes are coming from all directions towards the center.
-Make icons for each power-up, it would be nice to try to avoid certain powerups, and get others.
Otherwise, I'm kinda out of ideas for right now. But nice job, keep up the good work!
-SuperDrummer146