Hey there !
This problem is not common, have you managed to play the game since?
What software do you use for decompression ? Are you on Windows ?
Hey, finally I got some time to play it and overall I must say that this is looking great! I love the aesthetics and cinematics of the game. One thing that I can point out if you want some feedback is movement that is not super fluid, by that I mean character is often stucked or slowed when moving close to some stones etc.
Also I stucked at one puzzle inside the cave and I don't know if this is end of demo or I'm doing something wrong, but I can't move stone with water pipe to complete puzzle.
Anyway great work and good luck!