5/5 on the screaming of souls! I'm glad I read your comment about them only sticking to the small platforms. I played an earlier release you posted in the forum and couldn't get anywhere with it because they'd be sliding off the platforms. When there are no more souls I think it should tell the player and ask if they want to reload rather than sitting waiting for a soul that isn't going to come.
The aesthetic is very interesting and unique, I'm feeling a bit funny now, like when you play guitar hero so long it looks like the walls are moving!