I unfortunately found the game hard to play. As you already mention in the description, it is very dark up to the point of losing orientation. Sigils can be buggy and seem to be persistent after death. Sometimes the shiny orb from the beginning does not actually emit light, so you're stranded in the dark. I pretty much kept falling to my death at some point rather soon, which I suppose is part of the game and not me dropping out of the map.
I also at one point had to reload the page because the game wouldn't accept movement input anymore, although mouse input was still working.
I think this game would work better in a higher resolution (and proper light maps), but I have to admit I gave up eventually. Maybe release a fixed, high-res version outside of the jam?