The Appimage does not work on Any Linux based on Ubuntu 18.04 as I am using......this is because Appimages to be universal need to be compiled on Ubuntu 16.04 LTS or CentOS for the lower glibc versions they use. Can I recommend you guys do this henceforth and also maybe recompile Bugdom 2 to to ix this issue? otherwise that is eliminating alot of linux Distros and users. All the other games like Bugdom 1 and the rest work fine.
Sorry, the AppImage requires at least Ubuntu 20.04.
The reason is I use GitHub Actions to automate the builds. To build AppImages, I use the oldest possible Linux runner that they offer to ensure compatibility with old distros. That was Ubuntu 18.04 until April 2023 when GitHub Actions stopped providing that version and I had to migrate the builds to 20.04.
The other games that still work for you were built on a Ubuntu 18 runner before April 2023.
If you really want to play on old distros, you can compile the game from source.