Well you don't actually need all the sound files to run the cap.
It looks like a decent start for a tank game. Although it appears to be pretty hard.
- No decceleration if you don't hold up/down key. Like in realistic war games, where you set the acceleration handle of your tank and it stays there.
- The tank bounces too much for my taste when it hits an obstacle.
- Mouse-controlled turret would be very nice.
- Some kind of smaller obstacles which you can crush with the tank, but will slow you down a bit.
If I'm not mistaken your tanks are at all times aware of the presence of the player. You could give them some kind of range or line of sight and give them a path to patrol, if they can't see the player. And let them only shoot if they are in range.