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I'm looking for games with unique or experimental game design
The Unfinished Swan came instantly to my mind.
Some others that might intrest you but I'm not sure really qualify with the description:
Roto force - Quirky take on a bullet hell game
Yukos Island express - Metroidvania pinball
The Witness - Well known puzzle game that has you looking for 2D shapes in 3D areas, and other things
Quantum Break - Mixing TV between chapters, didn't live up to it's potential in my opinion