Excellent Game
I really like this game. It was easy to get into, it looked great, the music and sounds were very nice, and it was above all, fun!
My only problem with it was that it didn't become difficult enough. Yes, there appeared to be some sort of difficulty climb, with new and more challenging bubble enemies to face as I went on, but I was honestly never in any danger. I could even take hit after hit, and still collect enough bubble "health" from my fallen (popped?) enemies to never lose.
I quickly had my tank up to the highest point in its "evolution", and was never damaged enough to drop back down.
I would have liked to see some sort of "boss" tanks now and then. I saw some really big ones that looked like they might have been tough, but they still went down pretty easily (especially with my increased firepower), and they lacked enough firepower to put a dent in my armor.
Another thing that might go a long way to help this would be some sort of limit on the firing rate. Either a short delay between shots, or a metered limit on number of shots (either auto-filling after a delay, or filled by gathered bubbles) would cut down on the god-like ability to lay down an almost solid wall of firepower.
But, enough with the "constructive criticism". The game really was excellent. Just some room for improvement.
