There is much good about this game, I am happy to see numerous comments.
I will point that it is doubly good if you are a developer yourself: this game is suprisingly playable, surprisingly fun, has progression, has symbolism, has minigames, has lore, with just minimal screen estate and four buttons.
It is a lesson in economy of means and will for sure change how you see games and game-making.
The dev's Design notes are as interesting as the game and will make you look at it with new eyes.