Hi! Thanks for reporting the bug, I don't know if you know why this version of the game is in beta; some users asked me for the Linux version even though the engine I use (Visual Novel Maker) gives errors in versions like Linux Mint 19.2.
Recently, they even stopped supporting Linux, which is why I didn't release this version.
Unfortunately, I can't do anything to fix it, but some linux users make a kind of emulation of the game to play it on their Windows version.
I'm sorry for any inconvenience this may have caused you.