Cool interpretation of the vertical shooter. Enemy behavior is well-designed, creating interesting challenges in conjunction with the varied terrain. Also, the variety of enemies keeps things fresh.
The soundtrack is excellent, and really gets the blood pumping. Just right for an action game.
My main problem is that the one-hit kill is a bit too punishing. Sometimes I would get in the groove for a minute or so, dodging endless bullets in bullet hell, but then a single hit would bring me back to the beginning.