Wow, I have to echo what everyone is saying about the graphics and sound design, stunning work.
For constructive criticism, this is more of a nitpick, but for browser support it might be better to add a secondary key for the menu? So that you don't have to necessarily exit fullscreen to change sens
Also- I got completely stuck and I don't think there's any way to reset my position :(
(Through the secret path, right in front of the bigfoot, I walked too far left and fell into this crevice between tree colliders and the cliff and I can't get out)