Can't play game from zip file

Did you try making the file executable?

chmod +x OffTheBalls.*
./OffTheBalls.x86_64

Those instructions assume you're on windows, so I can see how that'd be misleading. Linux doesn't use .exe files, instead it has binaries that are marked as executable that you can run. That's probably an oversimplification, but I'm not the most experienced with Linux either, so correct me if I'm wrong.

What you need to do is unzip the zip file, mark the binary as executable, and finally run the binary . You can do this by executing the following commands:

unzip OffTheBalls.zip
chmod +x ./OffTheBalls.x86
./OffTheBalls.x86

Those steps worked perfectly for me on Arch Linux and should work the same on Ubuntu