Some touch ups in text, and mild things. It runs pretty well, in fact I was just playing on Steam Link, it works well when playing it on my TV.
Just the Wii U pro controller (possibly others) changes, on PC only it uses analog and X,B. On Steam Link it’s D Pad and B and A.
Store page is headed to a review.
Steam Direct system is a pretty smooth one, when the red tape is done, that is a pain, and it boosts the price of the game a bit.