Help build unicorn startups in this fun business board game - SillyValley

Hi guys,
I started working on designing a board game a year back around the theme of building billion-dollar businesses. To make it more fun and enjoyable for the players, we made the designs as a satire on Silicon Valley. Game Page: www.sillyvalleygame.com

We plan to launch it on Kickstarter early next year and are trying a lot of channels like social media, emails, etc to reach out and get early subscribers to back the game.

Anyone here has experience in building an early-backer list? We are working 80 hours a week juggling between job and making this game a reality and would love to get your ideas regarding how can we grow the early-backer list given we do not have a lot of money for running paid ads. All your suggestions and help will mean a lot to us, TIA :)