Please tell me this is just a demo version, or if it isn't - that you're already making a sequel. This game is lots of fun, but needs more of everything. More upgrades and more levels. Gold is meaningless after you've killed the Dragon a couple of times, and my Catapults are stuck at level 2 and always die because I can't get any more exp for them as I've completed the last level.
Yes, we are thinking about great sequel with more of everythig :-)