Introduce Silver crown and bronze crown for every level

I think this idea is ok...

@Elsa Can you also check this idea? I think this is a new idea.

However, this type of game in another company (Jam + Cookie) has this type of setting. I don't think they will add the same things.

That's fine for tagging me. You can tag me for all the ideas. I think this might be a good idea so let's see how many votes it gets.