I found an way to play Karlson on my Chromebook using Linux (Beta)
Also wondering does the game run well on Debian 10
I first installed linux beta, the typed sudo apt update then sudo apt upgrade then sudo apt install nemo. Then Copy the Karlson to linux files then extract the files from nemo. Also go in this link chrome://flags/#exo-pointer-lock once you see it click default next to pointer lock for linux applications then click enable.
I hope this helps