A small update to fix some things people have noticed.

CHANGES
= jumping insanity between two tile high areas is fixed.
= collisions are now better, so the vertical jumps should be doable.
= slime now moves with the moving platforms.
= arrow keys and AD-SPACE now both work to control the platformer.
= made the Level 1 solution more obvious
= general level improvements

PLANNED
= more levels, more actual puzzle elements.
= more use of the first and third rings, and the rings in general