I enjoyed the demo.
After I played it, I thought maybe I'll buy it, let me see if it's 800 points or 1200.
Then I realized this isn't an XBLA demo, it's a regular demo.
So I thought it was fun, but it's hard to justify $60 for a game that is just moving blocks and climbing towers. At least, that's all it seems to be. Maybe there's more to it?
Anyway, it seems like you all are really enjoying it, so maybe there is much more to the game than I was able to figure from the demo. If nothing else, it's at least a breath of fresh air.
It's a puzzle game wrapped within RPG elements. The story is a main selling point, in which your actions determine the outcome, so it does have replay value. The gameplay has replay value as well, with 2 player battle and a separate challenge tower with online leaderboards n stuff. So yes, I do believe it has enough content way over the initial 16-18 hours it'll take to beat.
However, I do find it harder and harder to justify spending $60 on ANY game right now.