Hi! It appears you've packaged the Linux version of your game in a peculiar way, which prevents me from being able to play your game. You need to take the .x86_64 file and run sudo chmod +x on it to give it execution permissions, then compress both that and the .pck file into a .zip archive so I don't have to download them all separately.
You might want to put the Windows version of your game in a .zip file as well, since most computers will mistake it for a virus.
Thanks!