How do you build a community for you're app from nothing?

I’ve made an app and I’m sorta looking for some folks to help test it out in the real world, but I have no reach on twitter.
Any body got ideas or tips on community building?

I’ll leave it here in case anyone wants a look and maybe try it out.
It’s a simulation of a trading exchange geared for social media sharing and having competitions with the aim of driving twitter engagment and providing some entertainment.