Hmmm, idea:
In the beggining of the game just show an text box saying something like "take what is yours" and then we can do the plot of the character taking part of their soul that are with the bosses
Looks great. About the multiple layers and bosses. We might have just enough barely time for one more of each. But I think we should polish some and add smaller stuff for now instead of making the game buggy with unfinished content when it gets released.
I can try to release it early tomorrow so you can try it out.