Really cool :) I like the art style and mood (music!) in general.
The core mechanics worked pretty well (even though i accidentally clicked on my character instead of the broken sand clock at the end and had to replay the section... but that was my fault)
The running and jumping felt a little too floaty for my taste. I did botch some of the more precise jumps because of that. But I adpated pretty quickly.
I would love to see some more context to the game world, maybe some story elements or more concrete world building via dialog or level design (even though there already was a lot of mystery revolving the level design)