Marble Marcher is entirely ray-marched (similar to ray-tracing) in real time and is played on the surface of evolving fractals. The goal is to get your marble to the goal as quickly as possible. There are 24 unique levels to master. This game is the result of a fractal physics engine developed by CodeParade that allows fast collisions with fractals and other procedurally rendered objects. As far as I'm aware, it is the first game to ever use this technique. The game is also open source: https://github.com/HackerPoet/MarbleMarcher