*happy starfish sounds*
No but seriously this was really good. The pacing of the tone shift was perfect for me; little hints at the start and then all of the sudden shit just hits the fan. I don't know if it was intended but the fact that the giftshop was an angler fish was also such a nice touch to hint to the player that it is a bad place that you don't want to go. Also the game is gorgeous, was easy to forget the feeling of impending dread just peacefully cruising through the environment.
Only criticisms are bug related, got locked talking to the eel in the angler fish section and a couple other dialogue issues others have mentioned. And obviously the crash in the web build.
Great job!