What version of the game would I be buying here? I'm guessing it's not any mobile version (though some devs distribute side-loadable Android games on itch.io.)
So, it's probably the "PC version" - but what does this mean? Just Windows, or Mac/Linux, too?
And lastly: what is the "activation key"? A Steam key? If so, will there be a DRM-free version, too?