Couldn't wait until it was over. Dull uninspired side-scrolling shooter fails to impress on all levels.
Levels and backgrounds are interesting and very unique visually, however whatever it adds to the game gets lost by the simple mash shoot and wait style of game play. No puzzles to solve, no tricky jumps or death elements other than getting hit from other baddies coming at you in an onslaught of identical images colored differently to let you know if they are one hit wonders or if it will take 3 hits to knock them off the map,
Look at your other options or pick up on of the classics on VC or WiiWare before dumping any money or time on this one. Multi-player is the best game-play mode just make sure it is with someone you don't like too much.
It is a good game to introduce newbs to the side-scrolling shooters, set it to infinite lives and go at it.