Had good parts, but was ultimately frustrating
I did like the idea of the game, combining platforming with puzzle solving. And the puzzles were interesting.
The length of time between screens was almost unbearable, especially during the lava rising section. Several times I died, just because the lava kept rising while the next screen was loading. I'd appear on the next screen, only to die straight away from the lava that was already there.
On the part where the bone creature chases the player, I fell down a lava pit, got stuck down there somehow without dying, and was unable to get back out.
The music seemed to have two different loops playing over the top of each other, and it was quite hard to listen to. I'm not sure if that was a bug, but it sounded like two pieces of music were playing at once.
I liked the game, but the bugs made it too frustrating to finish.