A direct message on Twitter is probably a good start if you need a quick answer to a simple question.
Send a message relating to a game at http://tackorama.itch.io/
Discord server link.
Send a message to games at the domain name (for any query).
Tackorama Ltd is a registered limited company (no 09259894) based in London, UK and the registered address is:
71–75 Shelton Street
But I wouldn't use snail mail if I was you because that address is for official business (and has to be displayed, says UK law, even though it's not Tackorama's actual location).
Help a solo developer feed his cat.