Geometry Wars 1 was the first thing I ever downloaded on my 360 when I originally got it. I instantly became obsessed and wasted a fair amount of time blasting gobs of gorgeous colors across the screen. Once I finally past the 1 million mark, I decided to give my thumbs a rest. A rest that lasted a few years.
I downloaded the demo to the second one last night and enjoyed the small amount of play-time they teased me with. Was interesting to find out that your gun no longer upgrades and your multiplier stays with you even when you die.
Still debating whether to buy the full version but it seems that you all feel it's worth it. Heck, it might be worth it for the multiplayer alone. Speaking of which, you can't play over Live can you?
