I know you guys are looking into making this a full game, so I played through a few times and jotted down the worst issues I encountered (please don't take this as pure criticism, I love everything about the game except for these few things and I can't believe it was made in 48 hours, even by a team of 6)
Needs a proper tutorial, I pushed every button I could think and still got stuck in some places (soul abilities are the worst culprit, I still have no idea how the grappling hook works)
There's a spasm glitch when attempting the wall jump, seems to happen when the player collides with anything that isn't a flat surface. I'd suggest only allowing wall jumps on specially marked walls, would help with game design and make your lives a lot easier.
Every time I reloaded a level I got stuck in the terrain, sometimes I got out, sometimes I had to keep restarting until I got unstuck. This can probably be fixed by spreading out the colliders a bit or adjusting the spawn location.
The soul is really bugged out, it often sticks to walls for no reason, and I'm not sure how to suggest fixing that because I don't know your exact implementation, sorry about that. Something that might help with the soul getting too far away is teleporting it to the skeleton when it's not within eyesight of the skeleton (you can still keep the same puzzles by adding "glass walls").
Lastly, for the maze puzzles, you should find a way to adjust the camera to a more 2D perspective when in that area, it'll help alleviate some of the frustration of getting stuck behind walls when in that location.
Can't wait to see how the game turns out, you guys definitely have something going here! And as a fellow music producer, Glim, I love the atmosphere you've created, wonderful job.