I have been following Merly's WIPs of the character and UI elements on the GWJ Discord since before the jam even started, and I liked them a lot. It's very exciting to see them in an actual game!
The mechanics are straightforward, though the down-arrow "tutorial" did surprise me a little bit: I thought I was supposed to go down that pit, because nothing happened the first time I tapped "down" (the character was still in motion due to inertia).
The way the story unfolds feels fresh, and the story itself is very original in its adventurous choice of subject matter. John's music works well with the narrative, with different arrangements for the two forms.
All in all, very nice game! I'd certainly like to see a longer version of it, but what's here is well done for a jam!