Sure its a demo..
I feel like people upload often their demo before they upload the main game just as an excuse; If you did a mistake; "don't worry, its just a demo" they say. If someone should ever find a mistake; just re upload it. Because for every time you upload a demo your game is missing more and more of its originality. If you uploaded the main version at once I could play it and enjoy it, now I already played this game. Even if you get some new stuff to your main version; I still played this game, just that you added a few more things..