That was a fun little platformer. As is, the game is very well done. I could see this being expanded, having different levels going through various parts of the world to get to Mount Foom. Like Fondor, Losgiliath, and the happy Thire. lol
I thought it was really great. I think the music was a bit quiet. Not that, that's necessarily a bad thing, but to look at games in a similar genre, the music just fills the sound space a bit more and makes the world feel a bit more alive. But that's a minor thing, so no big deal. I also found the level design to be pretty good, but I just have one thing I would have preferred: The whole time the player is working downward, but I feel if the player was working their way up, it would feel more like they are working up the mountain.
Lots of fun, keep it up!