Very nice experience! The link to the theme is rather weak in my opinion, but im glad you went with it. The art and general atmosphere is great. In terms of game design this is rather weak. A few dots were placed a bit inconveniently. In one picture I had to actively search for the dots after revealing the whole image.
Some kind of "fast travel" mechanic couldve been nice as well (as long as it stays simple). The camera allready zooms out so you can see undiscovered space, but the pictures were really big and it was very tedious to find your way through routes that have allready been revealed.
Nonetheless, I enjoyed this one quite a bit!