What a cute and chill little game!
Some suggestions:
- Record a capture of each container when you complete it and show you all the containers when you finish the game.
- All you to scale up or down the objects you want to place to allow for more variety when designing your container.
- Give each item in the catalogue its own placement and deletion sound. It'd be cute if the characters had small animations that they might perform at random intervals, so you have to watch your creation to see the occasional movement.
Excellent work for a 10 day project!