Just on the topic of demos, I feel like they are making a comeback these last few years (speaking as a PC gamer).
Steam has their Next Fest, which is all about demos, and I've found a few games there I bought later or put on my wishlist.
As for Talos 2, while I haven't checked out the demo, I really liked the first game, so I was gonna get the sequel anyway eventually, unless the reviews thrash it for some reason.
Isn't DF independent, and they just publish articles on Eurogamer? In that case I wouldn't worry too much about them, right now.