Nice game. One thing that would be nice to see is a "fire preview" in the tank editor. It's sometimes difficult to tell how your guns are aligned, especially if you're using spread weapons, so it would be nice to get an idea of gunfire coverage/rate.
Wish that uncollected bubbles were saved when you leave a bubble area. Because of all the lag (especially with bigger tanks), I keep accidentally leaving bubble areas full of bubbles and coming back to find them all gone...
A Sandbox mode, where its infinite gun points, bubble points, complexity, and where you get to test your weapons against self picked enemies. Basically like a training arena.
 "Bubble Tanks 3"){kind=icon}