Great concept! I enjoyed it, and it has a lot of great potential!
Maybe think about ways to make it more challenging. I found that I could throw the heart at my feet to get some light, and then pick it right back up over and over. Maybe think of reasons to throw the heart somewhere and leave it (on a button or to distract enemies) so that there is more tension.

Really creative and cool idea, small bug though: after you beat the game the mouse disappears still, so you can't click on the menu.

PERFFFEEEEEEECT