You obviously have lots of talent because this is well polished, but here's a tip for jams:
Take your first ideas, and scrap them. Brainstorm for an hour for a bunch of ones and pick one that is simple, unique (so not your first idea usually), and quick to make.
I've played this game with different sounds about seven times already.
The movement was... ehhhhh... Jumping had input delay, which would've been hard to notice until you realize this game has no or very little coyote time, making it feel unresponsive.
It was overall pretty fun, but I've played it before.
Excellent for 12 hours.