KIDS from Michael Frei and Mario von Rickenbach is an odd one, it's not exactly a game but more of an experience that brings you along for the ride. Note: Personal purchase.
This is the second collaboration between Frei and Rickenbach after 2015's Plug & Play, with both having Linux support and KIDS seeing Linux support right away. It's, uh, a little odd. Charming though in many ways, without giving away too much talking about it is quite difficult because it's very short at around 20-30 minutes long (exactly 30 minutes on the dot for me) but weirdly enjoyable.
If you like games that are short, experimental, art and/or you like throwing people down deep dark holes then it's for you.