Whoa, I've completely missed that one! Must have been deployed when it come out. Is it worth it?
Is it worth it? Maybe, maybe not, but it IS only $5, so either way, it is at least cheap. I got it, and don't regret it, but come in with low expectations, for sure. Basically, the game is a European side-scrolling shmup with some Ikaruga influences. The game has two switchable colors (red and blue, here), chains if you shoot 4 enemies of the same type, and such. The game has only five levels, but they're reasonably long, so it won't be easy to finish (the game does have quite limited continues; you earn more through play, but that's a slow process). I haven't beaten it yet, myself.
You can tell that it's a low budget game, though. The graphics are basic 2d stuff, nothing fancy at all, and there are some issues, like how in single player (the game is a two player simultaneous title, nicely enough) if you want to keep the chain going for score, you will have to not shoot at some enemies; you can't kill everything with one person unless you break chains. Overall it's a somewhat mediocre game, but for $5, which is all it costs, sure, pick it up if you like the genre.
Oh yeah, the male character is player 1, and the female one is player 2; there's no selection, each one is just tied to each controller.
In addition to WiiWare it appears that a few months later they released an iOS version, but I'm sure the controls there are quite miserable compared to the Wii version's standard, and good, "sideways Wiimote" controls...