- Copy tank.png, tank.py to the CIRCUITPY folder.
- Adjust code.py to import and run tank.py
- move tank with left thumbstick
- rotate tank & turret with some velocity towards thumbstick rotation
- move with some velocity dependent on magnitude of thumbstick
- tanks collision detection
- fire bullets
- do damage to "mountains" (translate them down on each hit) until they disappear
- do damage to other tank
- keep score - points per hit? kills? 3 tanks/game/user?
- outer game loop
- better art