2D platformer where you customize your character, attaching limbs and equipment wherever you like and then play
Twin-stick shooter where you blow up all the walls around you, revealing procedurally generated enemies and loot
A sandbox universe builder that lets you place and customize solar systems
A 3D platformer where you can travel across the 4th dimension, morphing the geometry around you.
A game that gives the user a randomly generated sky of stars and lets them determine the nature of it, by measuring the distance to cepheids for example