The amount of tokens you own is always broadcasted by @proofofbrain whenever you submit an answer. So, technically it's currently only stored on the blockchain. But, I will be making a frontend in the future for trading HIVE/HBD. There's still a lot of work that I need to do, hence why I called this release only a Beta version.

Regarding HE, I'm not sure if there's even a way to integrate proprietary game tokens with it. Especially in a decentralized manner. The reason why @proofofbrain sends the stats of all players out to the blockchain is to allow anyone to track token-creation.