Very decent game. I like the concept, and think it would translate well for mobile devices. That being said, I think this is the ugliest-looking game I have seen in a while. Simply horrifying font! Those MS-Word "3D" fonts have always been horrible.

Also, the levels themselves are very bland. I suggest using more of Flash's built-in filters like "drop shadow" and "inside glow".
Other than that, this is very solid design, and very simple. Which is why I like it.

out of 10...
gfx - 1.5 (almost nothing, and what is there is ugly)
sfx - N/A (i have no soundcard)
design - 7 (solid concept and level design)
gameplay - 7 (pretty fun, maybe reaction-time could be shorter)

overall, this would be a great game that more people would enjoy if it had more levels and had better graphics.