A lot of changes bugfixes etc.
Still has a lot more bugs tho:
 - The yellow ball is somehow stuck at the bottom of the screen occasionally
 - The obstacles are spawned with the wrong y-pos. (The floor and ceiling heights were updated)
 - Some obstacles are way too small...
 - Still too laggy. Perhaps might need to render RenderTriangles in the same begin() - end() block as the circles :/
 - Hooked obstacles (death traps) appear way to often...

 Argh :c