Beautiful game! Loved the look and feel, wonderful concept, wonderfully executed. Great example of simple to learn, fun to master, and introduced new concepts (i.e., clouds and gold power-ups) at a great rate keeping things fresh... and damp if you will.
Two suggestions of minor importance. At times I felt the moss appeared too slowly, having to double-back on spots I got, perhaps something like the red turning green more instantly would help this, allowing the lovely growing animation stay slow (or even come slower) once the feedback is instantly felt?
As a shamefully admitted completionist, I'd love to have a counter of those special little silver (bunny?, Rook?) tokens to know how many I have left either on top left or on the pause menu? Additionally (and this is more a matter of preference) it would be nice to have a map indicator for rooms containing ones you are missing after receiving the crown? Secrets are fun and satisfying to find without such things but after finishing the game I don't feel too motivated to seek them out not knowing how many left or where to begin to look or even if I have them all.
All in all, still a near-perfect game for me! Thanks for the experience, I shall forever treasure my title as the Moss Prince.