Very Cool
I really enjoyed this game. The graphics were very well done and simplistic; in a good way. The sound effects were cool and since the sound was pretty much constant I didn't really notice the lack of music.
To me, the coolest polygons were the ones that looked like throwing stars and the ones I hated the most were the yellow needle-like polygons because they were so difficult to hit, which I imagine is the point.
I think that with this being your first flash game you are well on your way to becoming a great creator. Keep up the good work! XD