This is one of the best tower defense games I have ever played. I like the combined elements of tower building, experience and leveling, upgrading your skills, and ground terrain. I would have liked if you could reset your skills but it does make it more challenging. 5/5
I like the game a lot and I would really appreciate a sequel. If you make a sequel, it should be harder and there should be upgrades for when you collect pixels or something and unlocking things should be more difficult. 5/5!
I really do like this game, it has great graphics, gameplay and physics are awesome, and the music is really cool. Like robotog said, if it had a centralized plot it would be cooler but overall great, 5/5