Really liked the forest setting of this one - I always enjoy a game where you need to scribble down a map while you're playing!
I only found 1 out of 3 secrets (not at all sure what you do with the fish or the hole), so I will be replaying.
Sorry for late comment, hope someday you try play again
For the hole the hint is: you need use something which can shoot some light inside the hole
And for the lake: you will need work with two items to make something see you and get closer
And thanks for play my game ^^ I hope the hints helps