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The developer seems to not believe in my report. Looks like he didn't want to check if something is wrong or do not have a Linux machine to test the builds.
I have erased and reinstalled the game twice (is less than 200 MB). But the Linux executable is still missing.
Is anybody having the same issue?
Things you could check is if the executable file has the executable attribute set. There could also be a problem with the letter cases of the file name. Had this problem with an other game once. Often, windows developer don't pay attention how there write the file names.
The demo has to executables: MegaSphereDemo.x86 and MegaSphereDemo.x86_64
I guess the full version has the same without the 'Demo' part. Maybe only one is missing and you can play the game by starting the other one?
Anyway, Steam didn't let me install the demo, probably because I already have the full game.
I tried to launch the game in the console, and it cannot find the libXcursor.so.1 library, but I have it installed and other Unity games launch and play just fine.
https://steamdb.info/app/386340/config/
As Dax Tailor said, check out if it has the same name in your folder.
Also launch it in console with ldd to check out all dependencies:
ldd ./MegaSphereAlpha.x86_64you'll see if someting is missing.
Looks like another case of a developer supporting Linux knowing nothing about it, just because Unity have a button to export to Linux.