J.P. Winkle's Jungle Hunt! is a 3D walking simulation / treasure hunt built in Unreal Engine and designed by Quadratic Games.
Machina Vol. II: Industrie finds me and my AI companions delving into electronic music and ambient soundscapes, creating new music using vintage synthesizers and drum machines.
Having a modern synth inside of the game engine with access to all of the parameters at runtime is incredibly powerful. It won't be long before we have gorgeous, true procedurally-generated music and soundscapes that can respond to events in the game.