This game is really cool and I think it has a lot of potential. It took me a second to get use to the controls but once I figured it out I was gaming. Like others have said the artstyle is great and does an excellent job at recreating that old ninja gaiden style. I just wish there was music to go with it, the SFX are a great touch tho.
Unfortunately I didn't make it too far, I kept running out of Life Energy and my spirit would die. I take to much time when trying to decide my next move, so the timer is good at making me feel the pressure but for some reason after leaving a body I would have the same amount of time left as when I entered the body. It would be easier if it reset as you hopped from bodies. It looked like it was meant to do that because the energy bar kept flashing between both the current and the full values.
I think this idea has a lot of potential and could be expanded on. All in all this is a stellar submission guys, amazing work and great job! (P.S. I really dig the Splendid Fox, seems like an upstanding bloke. In case you didn't know you can add that as a splash screen in unity so it pops up when the game starts :) )