Alright, I beat it! Took me an hour or so, there were some pretty hard bits. That was really fun!
feedback:
-one tile wide holes are hard to fit into, and there can be some trouble with walking over them instead of falling into the hole. I dunno how to fix this though, since there are areas that rely on one tile wide gaps that you have to walk over.
-There's a lot of environment variety, but not much enemy variety. Also, there's hardly any difference between alterverse 7 and alterverse 8 blobs. You should have them grow tentacles or soemthing.
-Alter-verse 7 is the weakest, in my opinion, just because it has no music. I think there's supposed to be a heartbeat going on there, but it's too soft to hear well, and it doesn't really add anything to it.
-World 8 is irritating, mostly because you can spend minutes at a time waiting for an appropriate alterverse to show up. Maybe you could give control of which verse you're in to the player? It wouldn't be as frustrating that way, and you could add more difficulty to the level without frustration, since you won't be forcing the players to rely on luck.
-I loved the ending! It was spot on. :D
Excellent game.