Definitely Jusant. It was just such a perfect game for me when I played it, chill but engaging in exactly the way I needed it, and something about the story just went straight into my heart unlike any other!
I've only got a little bit into the game so far and man everything about the game just hits home. If it were just a bit bigger or more freeform it might have been my favorite. I love the weird but recognizable world! Reading letters that sound like they could be straight out of our future hit really well.
Unfortunately it trails a bit behind Seasons A Letter To The Future for me though because it's less open.