I really liked how ominous the game looked! I loved the way you used subtle horror to add this almost Junji Ito-esque uneasiness to the entire game.
I should say though that there's a glitch where after crafting the Song of the Sea, I used it at the house next to the shore which removed it from my inventory.
This in turn hard locked me from the game's ending since I also ended up saving afterwards lmao and since the item wasn't in my inventory the game treated it as if I didn't have the item to begin with.