Very simple but bad custom tanks/enemy AI
I only say this simply because enemies always shoot at the very center of your tank, so if your entire tank was a couple guns made parallel on the top and bottom, and shrink the guns, no bullets could hit you because they only hit you on a vertical line, and youre on the left edge of the map. Seekers do go for a specific bubble on your tank, though, so they are able to hit you in this configuration. Obviously, the tank editor should have a bubble collision checker that makes sure all the bubbles on your tank are connected, thus preventing the problem of having an open centered tank.
Other than this serious game-ruining problem, it was a great game. I must agree with others though. RED COLOR SCHEME IS TERRIBLE! Where on earth do you see red bubbles? change it back to blue please.