I liked the theme and progression, but the 3D display and the darkness (even with the torch) made it really hard to see. Especially some of the platforms: I just had to jump around by feel because they weren't quite where they looked like they were? But maybe that was just bugs? At one point in the bottom center my character ended up mostly behind the wall, so you could just see some ghostly bits poking through. And the dragon stopped flying down and flaming after a while (maybe after I died and restarted one time?): was that intentional?
At the beginning it took me quite a while to figure out what to do: I didn't see my character on the left. Some sort of effect to point that out would be nice (maybe the camera zooms in there for a second, or there are some particles that start on the whole screen and zoom to your character, or a flashing arrow or something?).
I also didn't pick up the torch until I had explored every other area that was accessible at the very beginning because it looked like a spiky pile of pulsating darkness so I assumed it was an enemy.
Some feedback about your character's health (you have three health, right?) would be good.
I liked how in the early game there was always an easy way to get out of the way of the dragon's fire but then it got harder (like the right tower).
The platforming was a little floaty, and the friction on the sides of platforms was annoying (you can't just hold sideways and jump because pushing into the platform makes you not jump as high).
Overall it was good!