I really liked the visual and the sound! The board idea is also great. Interaction with the last two boxes did not work. It may not be implemented yet. In addition, the basic mechanics of stacking objects on objects (such as seeds on a bench) are not so easy to use. If I understood correctly, then the seeds must lie completely on the surface, otherwise the interaction will not work. I would probably make the trigger zone just bigger.
Good luck with the development and I'm waiting for the final version of the project!