A really cool game! The idea behind it is quite nice. I feel like if you could only see obstacles by using the light you have with you could provide some tension to the whole platforming, otherwise being unlit all the time seems like the best option.
Some levels explore this by having you use the light then turning it off to confuse your enemies and getting them off your path, which is a great idea if explored even further.
I think some sound and music could help with the game's feel even more.