Its a funny idea but at the moment it feels far from finished. Sorry for being a bit rude, but that was the first thing that came on my mind when I tried it.

Here are a few suggestions incase you still want to update it:
-> warzone does nothing (no maps for it yet?)
-> no mouse movement for the tank canon? mouse would be perfect for rotating the canon and firing the weapons. That way you only need 1 controller for a 2 player games, cause 1 can use the controller and the other one the mouse and keyboard.
-> to easy to get stuck, would be better if the tank bounces a bit back when ramming a wall and loses health (instead just getting stuck).
-> no keyboard key to fire the cannon? Spacebar seems to fire the MG.
-> lightning is to bland sry. Some ideas: decrease sun tilt, decrease sun lightning and increase sun ambient so contrast on rocks etc. is not big (so you won't get black spots on them).
-> minor thing: forest map has white texture errors on the trees (probably cause of alpha on the texture).