Thanks a lot ! It's precisely because the scope was not that big that we were able to create all that cohesion for the world and the art.
It wasn't that easy x3 As always : it is time committed that can make a project that much coherent, and we had the possibility to commit all the time we wanted to make the game as polished as possible, even if it doesn't have that much content.
Julie will explain better the story of the unicorn (there's already a comment a little bit bellow where it is explained), but in general between the principal puzzles we thought about some secondary things that the player could've done in the world with little rewards(Similarly to Kirby epic yarn, where therse's a lot of little things that can be iterracted with), and the unicorn was part of it