I watched the play-through of shattered lights now. I did not know it before but wow that is a gorgeous looking experience! I added it to my field research list. Thanks for the tip!
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My pleasure, yeah I enjoyed it :) Thanks for sharing your list. I have one other game to suggest, that I'm not sure would go on your field research list but maybe. Called Host. https://store.steampowered.com/app/828240/HOST/
From what it sounds like it's similar to the last one on your list, in that it doesn't use portals or non-euclidean geometry. It's a roomscale game on Steam that requires you to have ~3m x 2m playspace (I think you can get away with a little less). But it utilizes the space really well, with beautiful art and immersion, and uses 'sinking through the floor to a new layer' as its form of redirected walking. It's very short but very enjoyable imo.