Since the project has failed to raise minimum amount and there is no exchange to trade on what do we do with the HD-tokens we have receive?
What you mean? If you bought HD token with BTC/ETH etc they should return the invested money. And for bounty I think those tokens have no value.
For some reason I still have HD token on my waves wallet and it says it is worth some money. Probably is a bug I guess.
This project is one of the very unsuccessful projects of last year which could not make it past the softcap of its tokensale. It had good team, excellent whitepaper with fantastic objective but without enough people who actually believe in it. I guess the team is dissolved now.