The floaty jumping controls combined with the tight layout of the mountain platforms forced me to play carefully. But the ability to jump through the undersides of platforms was a nice affordance, and I ascended the mountain twice. I wasn't sure if anything changed from run to run, and I had no way of knowing how many times I would need to replay that section to see all of the dialogue or beat the game, so I stopped there.
Congrats on your first jam game, and I really hope you continue to make more. :)