is Savage Moon a good game?

I adored savage moon . The waldgeist expansion is very good too . The game is difficult however .

I would put Pixeljunk Monsters and Comet Crash above it in the tower defense genre

I like it on my PSP, haven't dropped it on my PS3 yet but if you like TD it's really a nice turn on the genre. The conquest of different planetoids is a cool twist, the tech trees are easy to get the hang of but difficult to master, and the graphics are above par for PSN fare...

It's good, specially with the expansion.

Also, Pixeljunk Monsters is good too.

Its a hardcore tower defence game. if you are into tower defence it is awesome. it is very difficult though.

I wasn't a big fan of it. It was ok, but I didn't play a lot of it. Maybe it gets more fun the more you play it...