Unlike most generative music apps, Kjetil Golid's Sonant isn't obviously just a machine slapping notes on some formulaic pattern for however long you can stand to listen to it. It's nice! But it's also fixed to a sonorous xylophone sample and background strings. Sliders control various elements of the music; I like them all maxed out, suggesting the rising crescendo of a song just before its ending, but never escaping that moment.
"Move sliders over time" would be an excellent feature to add.