I liked your interpretation of the theme and how tightly integrated it is to the game mechanics. Having the character ride along the beams is a fun concept.
Now I didn't like the delay on the controls and it felt a bit unfair at times. I found the best way to beat the early levels was to memorize the layout and once tricks was introduced to spam up up up or just up up on sections where there's no danger of instantly losing. That being said, I found myself more than enough times jumping away from one instant death obstacle right into the next one with no chance of reacting to it, especially when beams cross over and the character jumps downward when I expected upward.
The last 2 levels however suddenly became a lot easier, as all you needed to do was spam up up up, or against the dragon up down up.
All in all I can see the makings of a great game. Good job.