It looks incredibly well polished for a game jam game. The main mechanic is interesting. (Latching onto another soul and hiting the right click attack to be able quickly posses it felt realy satisfying)
Sadly I got stuck at stage 5. A couple of times I thought I reached the end of the level, but for some reason it didn't register. From level 4 it felt like the difficulty got way too high.
Also, the game is just too dark to see anything and it's easy to get dissoriented.
I hope you are able to take this idea and polish it into an amazing experience.