This was a cute game! I laughed a lot at the different histories of how the coins came to be made. It was goofy but in a fun way. I think you could have made the coin mechanism a little bit more engaging and less same-y if the dirt spots were in more varied locations, and required a varied number of brushes to clean off. Just a little bit of variability can really make a difference in perceived repetition for cleaning-type games.
Nice job on the jam, I had fun playing through the game!