Beautiful artwork, and the core gameplay is creative and fun. I managed to beat the game after about 25 minutes and enjoyed it.
In terms of feedback, it didn't seem very balanced at all, and I was never worried that blue would win but played very defensively against red all the time. I think it is very luck based and I just restarted level 6 until good cards came up. I think it would play better with a larger deck which doesn't reshuffle every level, and I think if there was more variety between the towers than just damage and reload time, it would be more fun.