I picked this game up a few months ago but never got around to playing it until last night. It's a beautiful top down shooter with an involved story, beautiful graphics, sound, and music and for a bullet-hell type game that can get quite difficult at times, the designers ease you into the difficulty and it's not a frustrating as other shmups can be.
It reminds me a lot of Don Pachi with the varied weapon types and bullet patterns.
Up to 4 players can play at once with attached gamepads, keyboards, or mice. After much tinkering with PPJoy I was able to get it working great on my cab.
Well worth the measly $10 for this one. Pick it up.