Hey, thanks, glad you like the game. :)
I've got Ubuntu 20.04 LTS installed alongside windows on my laptop now so I'll be testing on an actual install and not a VM for the newer versions.
The current demo was only tested in a VM, but once I update it I will update the description as well.
As for releasing it as a .deb, I can look into it, but I think Game Maker Studio v1.4 might be too old at this point to create functional .deb packages.
So that might not be possible unless I upgrade to Game Maker Studio 2, which will probably not happen for a while, if at all.
Thanks for the info though, even if I didn't really need it anymore. ^^