The game looks GREAT! And I love the crunchiness of the walking sounds hehe. I'd love a more refined way of catching the fireflies as I felt I struggled a little bit. Also I'm not sure it felt "fun" to sometimes just end up in the dark walking into things. Maybe having the fireflies appear in certain patterns and you base the collection of getting from A to B to C in a sort of time limit before the flies escape from your lantern? It gives a bit more of a pressure to a very calming experience haha, maybe not what you want but thought I would share my thoughts!
Nice work!