Hey it's me the code guy,
Thanks for taking your writing this. You are probably right about the sliding and jumping but as this is my first platformer and we had a time constraint, I couldn't do much experimenting.
The reason for the dash sound playing in one ear is hilarious. I made that sound myself and deleted the right channel at one point. However I didn't notice because my right earbud stopped working on that day and none of my teammates mentioned this for whatever reason. I only noticed after the jam was over and there was nothing to do lol.
Your game is one of my favorites from the jam btw