Cool concept!
Really eerie how you can't anticipate the direction of the assault, but I like that element of challenge! The tank handles really well, I like it's turning mechanism...the upgrades get diverse, and the trick is to just keep moving, very realistic to an actual jungle scenario...the sound and background music is appropriate, and the graphics satisfy me; This flash rocks!
My only complaint is how small the stage is...you go up and down and only a little to the left and right...the only improvement I would make on this is to increase the roaming ability of the tank. Other than that, challenging and addictive! Voted 5!