Little bit of existential horror to brighten ones day up, very fun. The story was very interesting, the ambiguity added a lot to it I think, but personally I liked it at its best just before the end you just racing to the end. But yes, the caves were nicely done, while they were super empty and barren, just the branching and shape of them made them feel real enough to have that sense of exploration and at times lost. There were also good amount of tiny details here and there, which added a lot, the sounds of the cave, ambience lights in the cave, and how the character sprites standing far away from you changed (like at first I was thinking it's just trick of the rendering, but no, I'm sure they changed, creeped me the hell out in a good way too lmao).
And further more, it was a full package, which I love to see! Great work on this!