Well, 1.3 has some big changes, added a new game mode, changed the voting style a little, even added a few bonus levels and scrapped and implimented some skills. Added a few humorous things too... if you can pick 'em out, they're subtle, but give ya a good chuckle.
I was a fan of Stacker Tds in starcraft, but I think this one is really good, way better than Sc's and a great work. I think that some race should be balanced somehow because Hellions can get uber if they know how. ( Mass Balrog )