I loved the first geometry wars, but got bored that it was the same thing time after time. Which is why Geometry wars 2 is so amazing! I love the different modes and the different challenges each mode brings. Plus add on the achievements and this game keeps rocking hard!
My girlfriend loves to watch me play and get all worked up. I love the challenges each mode brings because it is what I like to do to keep things interesting. Like when you were a kid and said "the black tiles are lava" Definitely worth the $10 as if it was an arcade game it is one I would eventual (pretty quickly) sink at least that into.