SpaceRat TODO
Unified score system
 - objects, when cleaned from the list, offer up their score value
   - would allow for score badges to pop up
Player has shield/armour
 - Enables boosting shields with goodies
 - allows for different enemy ammo types
More enemy ship types
 - Spider
   - How will it move? Figure-8 with random direction changing?
   - Multiple hits to kill?
   - Ammo simply weakens shields, to allow other enemy ships to get player?
 - Mantis
   - Moves in a "bounding" kind of motion, towards player
   - Crushes player bit by bit once it reaches
   - Multiple hits to kill
Proper levels
 - Need more enemy ship types
Bonus goodies
 - Not too difficult, needs thinking through
   - for instance, do goodies drop randomly, or from enemies taken down?
   - how to implement goodies that change the player's appearance?
High score list
 - No point until proper levels are implemented
About box?
 - Maybe a splash screen? Something more complicated?
Player death timeout (temporary invulnerability)
 - need better flashing algorithm
