Limboh it give some checkpoints... you must only jump downside on the platforms.
And maybe you have right thet is not fair without hint ingame with the beginning but thet is from the first version of this map where i had make only the wall and the activation door.

Tricky level, but once you get the timing it's not too frustrating. Just two things:
Why are there no checkpoints?
And I didn't think of jumping around the wall behind me on my first tries. That's just mean, tricking the player like that.