Well, it's a Milestone game, so it isn't a traditional style anything really. It's a bit more developed and fluid than Radirgy. The scoring is intricate and really it's easy once you give it time, it's just like any shooter really, but the icons are so random it's hard to tell what does what - it's wilder than the Parodius series and the artstyle is sorta Jet Grind Radio / Graffiti / Anime mashup.
If you go in expecting it to be Psikyo or CAVE - then you'll think it's silly. If you go in open minded, you'll find it's a very well developed and challenging game.
This is the team that did Chaos Field, Karous, and the Radirgy series - great stuff.