Have picked this one up again and added a fair whack of new mechanics in for chapter 5, 6, and 7. Kept the number of levels down in each just to test out some ideas. 

Ideas like shifting the levels around, pattern matched key puzzles, and a watchtower that delights in pushing you off to your doom should you stay under its gaze for too long.

Some actual 'puzzle' elements to the puzzle platformer tag. Which is fun.