The strong point of the game for me is the visuals and the moody lighting and sounds.
Thematically, I was going to do something very similar to what you went with here, as in light being the lifeblood and letting it run out resulting in bad things happening, so I had a curious interest as I went along.
I think the animation and move speed needs upping a touch, movement felt a bit flat in general really.
Conceptually and aesthetically this is a good game, just needs some small gameplay tweaks to improve it and make it a better gaming experience :)
Well done and congrats for your first jam game :)