AAAAXY. AAAAXY is a nonlinear 2D puzzle platformer taking place in impossible spaces. You can take a walk on a Möbius strip, try to find the platform with your train at the train station, and play a piano that makes the Shepard tone. It will be a bit confusing at first, but I promise it will eventually get fun.
It’s not on Steam, but it’s available for download on the website for free. Linux, Windows, macOS, Android, and iOS. Also on F-Droid and FlatHub. give it a try im begging you