Read about this on a few forums, and some shmup enthusiasts seemed to be pretty suportive of this indie game.
Since it had a new low price on steam ($3.95), I went for it.
It looks a lot like (a poor man's) Geometry Wars, although it plays differently. Not bad either. I just think it doesn't really stand out from other, similar games, and there can be better shmups had for free.
Still, it's not a bad game and the price is really low, I just expected it to be a little more special with all the backing it was getting from the enthusiasts