The concept is neat, but the game just isn't fun, sorry... The difficulty gets ridicolous after level 4 (where those horizontal-moving particles start appearing). It's not skill, but luck-based, because the controls are poorly implemented and don't allow for a precise enough movement and the enemies move randomnly.

Really neat little game, I enjoyed it (just finished it). The levels weren't too hard, but not too easy either. One thing I didn't like about it that there's no undo button, so one mistake means you gotta redo all of the level - even if you already know how to do 90% of it, which makes it a bit repetitive.
The music was annoying as hell and didn't fit to the game at all if you ask me. I simply HAD to mute it. C'mon, there's so much good music free to use in the audio portal..