Create Asteroid, Ship, Game, and MovingObject superclass
Implement ship collisions; alert on collision
Implement screen-movement wrap-around
Implement Bullets in Bullet, Ship, and Game; key handling still buggy
cont debugging key bindings and ship#power
Debug key bindings by passing scope; implement bullet firing
Implement bullet-asteroid collision in Game#checkCollisions
Implement addAsteroids timer; buggy
Implement win condition; Next steps: debug addAsteroids timer, add Points, and switch movement controls to rotate
Fix ship#fireBullet error; refactor
Change background and ship image
Add asteroid images; now use directional rotation
Add levels
Add lives
Add lives image
Add score
Add level display; redo spaceship image
Debugging ship display rotation
Complete rotation debug
Multiple backgrounds and ships; change on levelup