Always exciting to see Spritely progressing! I think small examples like this are really helpful in demonstrating how you might use it; the object capability concepts Spritely draws on, though well-established, still aren't widely known and understood. Every one of these helps me understand it a little better. :)
Still, I think Spritely is already one of the most approachable places to start with object capabilities. Looking forward to seeing where it goes!
FYI: ...a tile-based garden game where multiple people could plant things...This very simple game is modeled after a community garden.