Two more levels and a crucial bug-fix

This update contains two new levels and a few bug-fixes. My intention in the future is to make less frequent but bigger updates. However, since I found a bug that hard-locked the game a smaller update seemed necessary.

One new level is intended to give an impression what difference it can make whether a platform or the frames are moving.

Personally I like this level, because its actually quite easy, while being kind of weird and disorienting (in a fun way, I hope) to play.

The second new level introduces timed buttons (buttons that deactivate themself after a given time).

This mechanic already existed, but no level used it.

Besides some minor bug-fixes, there is one important bug-fix. Ironically, the "Unlock all levels"-button did hard-lock the game. This is now fixed.