"Diedream," by Alfred Valley. It lets you simulate dice and run oracles all in your head using only a few easily-memorized rules, so you can play as you drift off to sleep. Also has a cool, glitchy aesthetic that reminds me of LSD: Dream Emulator on the PSX.
I found Diedream so entertaining that I couldn't resist making a module for it. "Village of Dolls" is now available on my itch.io page. Listed as pay-what-you-want, but please do take it for free.
If you give it a play, let me know! I'd love to hear where your adventures take you.