You don't log in. You simply play. And when you are done, it asks you to save your highscore.
Input a valid Steem username and the score will be saved and a transfer for the earnings sent.
It only has to be a valid Steem username, not necessarily your own.
It would probably be better if steem login was supported.
You could add it with steemconnect.com
I see absolutely no benefit to having steemconnect on a retro proof of concept game that pays out minimal payments.
If this were a big platform that was possible to really pay out people I would make it far more secure.
But I'll be needing some funding before I work on that.
I like the implementation you have now - super simple and straightforward, don't have to put in my keys anywhere. I hope you keep it up.
I too don't think its necessary, If it only takes a username and no password... Good game!!