Meh...
This feels like a huge down grade from the other games. Being able to design the tank is kinda fun, but not so much when it takes a long time to get a tank that's actually good. I personally liked it better in blue, and I actually got stuck in between bubbles at one point while playing.
This game is kinda starting to feel stale, especially when it's entirely up to the player to be creative. I would've loved to see something completely new, maybe some new type of enemy that's not necessarily a bubble, but I digress, not my favorite bubble game...