The full game was released for Xbox first, and I think there was a free demo before that release. I don't have an Xbox, and don't currently play any PC games, but my Xbox owning brother told me about the game and that a PC version was forthcoming. I think it's now available on Steam, but this version requires an Xbox controller (not keyboard and mouse). I haven't seen anything indicating that there's a demo version available for PC.
Again, not a big gamer, so all of what I just posted could be wrong.
You are correct sir!