How on EARTH did you all make this in 48 hours?!?! I'd be amazed if you did this in 3 months. Wow wow wow wow wow. I can't wait to see what you guys create in future jams and in general. You've all got a bright future as game devs, that's for sure!
That being said, of course there were little issues here and there. For me it was primarily optimization, lack of a tutorial, wall jump, and not being able to rebind keys, but all of those things have been mentioned in the comments so I won't get too redundant there :)
The only thing I'll add with the lack of a tutorial... it might help to have a visual indicator when the soul is being used (it glows brighter/changes color when left mouse button is clicked?) so it becomes clear to the player when the control is transfered to the soul. Without that, the fact that the soul sticks to surfaces is a bit misleading because i thought it was like rope physics. I spent way too long trying to run as far back as I could to pull the bridge down haha.
But really, all those things are trivial compared to this masterpiece you've created. I'm so happy to see you all plan on creating a full version! You can guarantee I'll be there to play it as soon as it comes out!
Really amazing work y'all! Best of luck in the jam!
-Sasha