For a first game jam, this is an excellent game. Some of the jumps can be a bit fickle, but aside from that it comes together very nicely.
Some things to note that I encountered while playing the game:
Whenever I wasn't full screened while I was first playing and couldn't see the walls on both sides of the screen. As a result the first spikes wall became a lot harder as I thought I had to jump to the other side of that wall, then jump up as far as I could to then jump and dash to just make it to the next platform... Technically, it did work, but it is pretty specific of timing. But this is moreso an issue of resolution rather than gameplay since I just couldn't see that there was another wall to the right of that first spike.
I think you're already aware of it since you made note of it, but if not the second spikes area, the platform that you can fall on can get you locked into a jump/fall.
Sometimes on platforms you can get caught on the edge and be stuck in a fall pose, but you can still jump, though moving platforms don't recognize you as being on them.
The first falling platforms area has a spot that you get caught on while crossing them.
That's what I caught while playing through my brief look of the game, overall very well designed, I'd look forward to seeing what more it can become if you do choose to expand upon it. Fantastic work, keep it up for the games to come!