picked it up during the holiday sale and it's pretty interesting for a shooter. i like the gravity well as a weapon approach. haven't played much of it yet though.
the gravity gun is cool, even if I didn't realize I had it right away. they say 1-4 people can play this, but from what I've seen it feels like you need at least 2 on some of the opening levels. I somehow managed to skip over the tutorial, probably because they give you an option to move forward one galaxy right away.