I've gone through everything and cleaned up a lot of stuff! You can now cycle through levels using [ and ] or LB and RB. Resetting the game is now done by holding the Restart button, so now the game has full controller support. The endings have been cleaned up a bit, and a few odd soft-locks removed. A few of the hearts have been redone, and some ui issues polished. Player movement is smoother now, making it a bit quicker to get around. 

There have also been a lot of optimisations, all with the goal to get a performant web build (which is on its way). There have also been a lot of Windows-specific optimisations that should help Windows users. All round, a much cleaner experience!