Nice, atmospheric game, though I did struggle a bit. My strategy was just rushing and lighting the nodes while being completely swarmed by enemies, lol. It might help by increasing the starting amount of light energy if you wanted it to be more manageable, but that's up to you, of course.
The ambience and the footsteps add to the atmosphere. I like that there is music when the enemies are near to emphasize the danger. I did seem to encounter a bug where all audio cut out once I entered the second sector.
I managed to get to the third sector of the game, but I eventually found myself wandering around, unable to find the last nodes to light and kind of lost interest after that. If you decide to expand on this, it might help to make some parts of the environment look distinct from one another. Other than that, nice job on the game!