@@DEEP_CAVE_PGDTheory of Everything 2 is truly harder and is confirmed by its star rating. Theory of Everything 2 has a 14 star rating and the star rating for time machine is much lower, confirming that it's much easier than Theory of Everything 2
It's an online level that can be found when searching for it. To answer that question, no I did not make the level and found it when searching random things in Geometry Dash