Like all other comments have mentioned, it took me a while and a few attempts to truly grasp the controls. However, as though as the game is, it feels phenomenal to master its mechanics!
Design-wise, the idea was pretty ingenuous! While the base idea of having to move down and up by extending the knight was already great, the later levels with the corridors where the heads and feet actually get stuck and you have to push them up and down to avoid the spikes in the middle were great, and extended (no pun intended) the mechanics in a pretty great way!
The presentation was also top-notch! If anything, I just agree that the difficulty curve should just be a bit more adjusted so a lil'bit more lenient while you are still getting used to the controls. In the current version, however, the coins serve as a fantastic hint and way to show direction.
Overall, fantastic job! Ended up mastering each level. Thank you so much for this fun bit! Cheers! 🐳