I was so close to buying this on Steam for the past few weeks, but in the end I decided to wait for the PS3 version. I'm hoping for Move support, very very excited for this game, if it's half as good as Portal I'll be delighted!
Edited it to include PSN and also I read rock paper shotgun review he just picked at the faults instead of what worked or what was interesting about it. This and Krater are sitting on my wish list I'm tempted to just buy both and have a bash.