Thank you for providing a Linux build!
I enjoyed the game. It reminded me of the "Nutty Putty" story, scary stuff.
Also, before meeting the monster, there is an alternative path. I went through it in my 2nd playthrough, only to be disappointed when I learned it that leads to a dead end. I thought it would lead me to a different ending or something.
An alternative ending when you pick up the gem and escape the monster would be cool.