Yeah, this version doesn't have much in it. If you're new to the game and haven't watched anyone play, you'll die a few times until you figure out how to purify water and eat, as it doesn't have a help/tutorial, or a reasonably polished user interface. Once you figure out how to drink and eat, it's up to you how fast you can do everything available in the game. You might be able to finish it in an hour or 2-3, depending on your skills and maybe even PC performance. :P
There's not a lot of content compared to the game on Steam, and it looks a bit rough, but it's still a fun game for a couple of hours. :)