The visual design is beautiful, but the mechanics don't mesh very well. The timer feels a bit arbitrary, as you have such limited control over the character that it's not really speed-dependant. And that means that the level designs either make the timer irrelevant or just unfair if it slows you down right as you've got to the end. The point is that the gameplay challenge is click-jumping at the right moments, which doesn't really have anything to do with racing against the clock in the way you've designed it.
On all levels with moving things or blinking platforms, it seems like it would make sense if player death reset the level to the same starting state. It feels frustrating when you're stuck in a bad cycle and have to try to kill yourself at the right time to get into a good cycle so you can actually finish the level. Other games with this sort of mechanic are much more deterministic.