The Birdman Emulator is a contemplative/super hard 3D platform game originally created as a swan song for my custom game engine, Iron Horse.
It's overall an hour's worth (give or take) of evocative audio-visual settings, with peaceful journeying stippled over mean jump and run sequences. If "art game", "surrealist" and "experience driven" are good words to you this may be worth a try.
Somehow I couldn't let this one go so I remade it completely and the game is now available on itch.io and the App Store.