As a quick recap: The players have all been ripped from their home worlds and become lost in the infinite cosmos, but gained the ability to move between worlds through rifts.

The last rift led to a flying island in an infinite sky, and a helpful old man is piloting it to the next rift for them.

I dunno what exactly you're looking for or how long "one sitting" is for you, but off the top of my head:

Bastion or Transistor (twinstick action)
Fran Bow or Little Misfortune (point and click adventure, dark themes/visuals)
The Room series (3D puzzle)
The Wolf Among Us (third person choose-em-up)