For those of you who are still interested and where eventually facing sounds problems under Linux (and only Linux), let me inform you that in the last update of Metagolf I added an experimental ALSA support along with the original PulseAudio driver support.
You will find a second version of the executable next to the original one but I recall : this is experimental, it's always better to simply install the PulseAudio driver.
BlitzMax (the programming language used to create Metagolf) being silently discontinued, it's getting harder to support every Linux decision changes about drivers.
I also fixed every images in the thread because for some reasons they just disappeared
Thanks for reading this DevLog