I like the concept of the whole "travel into books" thing and the presentation is really cool, mouse control camera + wasd works really well here, although i'd say you put the camera speed a bit high.
Pretty impressive that you went full hub world with multiple levels and some metroidvania elements for a jam game, and all in 3d on top of it :o
The game feels a bit rough around the edges(still fine though considering the jam's timeframe and all) but i like it and had a good time, i have encountered some bugs though !
When collecting feathers i assume it should be the same as for opening chests, that you only get the chest tune, well for feathers the level tune was still playing and the chest tune overlapped it.
And i also encountered a random crash, when i first entered the tower on a new game i jumped into the pyramid level and the game crashed("Godot engine has stopped working" type of crash to be precise) and then relaunching the game after having gone to the snow level first this time, i returned to the hub got into the pyramid level and then it worked just fine, played the windows build.
Other than these issues, cool entry so still good job :)