TODO:

+ Time Runout
! Select Level
+ Climb Hill
! JUnit

o The UI, right now, fully rerenders at every frame. I forget why I
  disabled the whole "dirty" thing, but it needs to be reenabled.
o Scrolling

Bugs:
+ If the height of the floor is one pixel, then it is not registered
. Bouncing doesn't work.


Legend:

! - Have to do it for the next turn-in
o - Have to do for the final turn-in
. - Would be nice to do
+ - Done
- - Cancelled