I did endings 1 and 3, and I appreciated your game!
I think the concept is good and easy to understand, like the story.
For visual and audio, I find that it fits perfectly with the atmosphere and I like the creature's cute design. Also, the introduction is nice.
Without enemies I found the game a bit empty, you could add little flowers in the grass to add color for example.
I also think that the addition of several levels can be a good idea, with new mechanics to avoid monotony.
A pause menu to retry or quit the game can also be a good thing to add to your game.
Aside a strange camera behaviour when you walk under trees, I didn't encounter any problem.
Sorry if I was too severe and I hope that my feedback will help you! ^^