I have been playing a LOT of games on here. So, I wondered, could it be possible for me to contact a person of a game they have built in order of that I can do a walkthrough or just plain record the game as it’s being played?

Some way down the right hand side of the game's web page you will see some details, including the author. If you click on the author's name, you go to their page, and from there can send a private message.

Be warned, most are probably no longer visiting the site, so will not read your message.

Thank you!