This game is visually pleasing and the sound effects are good. The music is a bit repetitive. It's a fun game to play and I like the overall look and feel, the controls are fine and the game seems pretty polished. I'm curious, is there an ending? I kept trying to get to the end but I wasn't able to. The patterns got a bit too frantic after some time (which is good) but the big round bullets wrecked me.
Oh I almost forgot to mention: I absolutely love how the arena keeps moving and expanding/shrinking while you play.
Great job overall.