Super cool concept! I had just left a comment on another game about how visibility-based platforming mechanics are a cool idea but hard to implement. This is a really cool take on that idea! If you explore this idea further, I think having some more feedback to orient yourself in the world would be nice. I had a really hard time judging my timing relative to falling. The bar at the top of the screen really made this playable for me, I think it'd be nice to be able to drop a marker onto that bar once per level or something (particularly for the more complicated multi-part levels like the last one). Overall, really cool game!