Highly recommend playing the demo before launch. The first chunk of the game slogs a bit as it mainly focuses on exposition and tutorializing everything. Save progress carries over, so you'll set yourself up to hit the ground running on launch day.I've stayed away from the demo just because I want to keep it fresh for the whole release, but I've seen some of it. I also was watching some vids on how the game is horribly optimized for the Deck but so far they've already released 2 patches and as of yesterday apparently it's running much better.