How to use Astros Playroom coins?

Can you tell me more about how to use the Astros Playroom coins? I've been hearing about this virtual currency, but I'm not sure how exactly it can be utilized within the game. Are there specific items or upgrades that can be purchased with these coins? Is there a limit to how many coins can be accumulated? Also, is there a way to transfer or trade these coins with other players? I'd appreciate any clarification you can provide on how to effectively use and manage Astros Playroom coins.