As it seems I can't explain how this work on this pages I'll explain it here:
It's a Boot sector game,but luckily dos can execute them, so double clicking on com file on windows should work,
Otherwise you can use dosbox or wine to start it.
If you want to use it as boot sector program, you need either to put them on a drive/disk and boot it, or use an emulator like explain in the github page or the game page.