Pretty fun game. Feedback:
Chatter between characters is pretty interesting.
Mechanic with switching characters is good idea. I liked that it was used extensively.
I got stuck for a bit in the pitball, it was hard to move one ball out of the tunnel entrance. It was worth the joke though.
I liked that there was a combination of skill tests and puzzles.
You should be able to enter the level with action button. IT's a bit unintuitive that there is action button but you use jump to enter the level. I think both should work.
Boss fight was pretty cool, I liked narrative idea with biting off the tongue that upped the challenge instead of just doing it without reason.
Overall good game, looking forward to future versions.