## Levels:

- get rid of floor image
- use background image over whole screen size
- put level on top of it
- paint level in levels/**.lvl on whole screen into the middle
- use first line as background image name
- ignore comments in lvl files
- add whitespace-mode flag in lvl files
- check when sphere bounces from one end to the other endlessly w/o any solids in between. this is a game lock and equals game over

SYSTEM Stuff:

- initialize systems in NewLevel()
- replace level.Update() with systems update
- mv Draw() from level to systems
