Bright idea! Took me a couple levels to understand what was going on. Specifically, the first one where you can die is where it clicked for me.
I'm currently stuck on the level with the yellow dot on the left. I don't understand what's going on and I can't seem to be able to finish it.
Nvm, it unlocks the exit. I guess I was simply falling too fast and died every times I approached the goal.
Criticism: Levels introducing a new mecanic should be easier and focus on teaching the player how this mecanic work.
Keep it on :)