The trick is to understand how our hero flies!

- If you do a very quick double jump while holding the jump button the second time, you will notice that our blue boy flies slightly above the jump he just performed;

- With this in mind, try to perform a low double jump just enough to avoid the bottom spikes;

- When you're about to hit the ceiling spikes very quickly release the jump button and press it again. This will allow you to descend instead of hitting the spikes above.

Here is a video from level 10:


Beware!! Just before completing the level, there is a fake floor that leads to another set of spikes... That's why I made that jump at end of the video.

Hope I could help you and If you have any questions please feel free to ask! ;)