Neat Concept! Very cute art style.
I like the idea of learning languages by exploring.
I did find the Trees blocking the way kind of annoying since the movement speed is kind of slow. I had trouble speaking to the crow in the tree, and the crows in the lake.
Ideas:
Maybe add a progression indicator? Ex: You learned 78% of the crow language.
Make the racoon speak? If the raccoon is looking for it's child, make him ask the crows. (Maybe not every time but per area).
Make objectives unveil themselves as you learn languages: Ex: a crow tells you to tell the bear blocking the way to wake up. This tells you to learn the bear language to progress to the next area. It makes the next objective unveil itself by using your main mechanic!
(These are just ideas. Doesn't mean they fit with your game.)
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Good job! I'll keep an eye on the project!