CircloO 2

CircloO 2 strips platforming down to a single circle rolling through circular levels, no jump button most of the time, just momentum built up by rolling and released at the right point on a loop to carry you where a straight run couldn't reach.

Because there's no way to brake sharply, planning a route before committing to a loop matters more here than in a normal platformer, overcommitting speed into a spiral often sends you flying past the exact platform you needed to land on. Later levels introduce gravity-shifting sections and moving hazards that only make sense once you've built an intuition for how momentum carries between loops. Core Ball works a similar momentum-and-rolling physics angle if this one clicked for you.