Very interesting concept! The game is basically impossible because it is an instant death. It would be nice to have polish in the sense of sounds/music and a more fleshed out art style. Also, it took me a few seconds to understand how the games concept and items work. A brief explanation would be greatly appreciated! The explanation can even be added now on your games page and might even bring in a few more people to see it :)
Edit: Also forgot to add that shooting with space is very confusing when you are aiming with the mouse. I would suggest switching to use "Fire1" instead which in unity will make it use the left mouse click!