Thanks for all this great feedback! I have no idea what's causing the sound bug, but I think it can probably be solved by just replacing the sound effect. As for the animation bug, it's been surprisingly difficult to resolve. I'll get to it eventually. I also would like to add more abilities... and more puzzles... and eliminate the possibility of soft locking the game. :)
I was most proud of the character-switching system, something I had never done before. I'd like to employ it in future projects.