basic working version with entities - need to define all the collision behavior
add randomized asteroid spawning, destroy them with lasers
add some very basic animation for the engine
add some background scrolling so the ship feels like it's moving
add parallax scrolling, tighten up graphics
explosion animation on death
add walls, switch to acceleration controls, some animation tightening
make ship slightly more responsive
add score tracking
bounce off the sides of the screen
add animations for banking left and right
re-do asteroid graphics, fix up laser collision w/walls
add tutorial image, make ship more forgiving to control, add a little variety to asteroid velocity
random orientation of asteroids
add sounds, tighten up controls again, remove bounce off side wall, add death message
sound cleanup, smooth out ship acceleration a bit
clean up star parallax layer, fix explosion clicking noise
refactoring, add y bounds checking
updating death animation (unfinished)
finish death animation edit