Really nice precision platformer. I see a few people say that the last section's difficulty curve is very steep which I don't fully agree with. The difficulty does increase quite an amount at the end, but I believe that it's difficult cause you can't really see when to jump in the few attempts cause parts of the obstacle is cut off screen. Zooming out the camera or having the camera move to a certain position in that portion could fix the issue.
I don't know how to feel about the double jump. The second jump doesn't seem to give you enough height to warrant needing it and could have been replace by having only one jump but with varying heights, depending on how long you hold down the jump button.
Still good job overall.