Windows 8 Apps/Games

I just created a Windows 8 game called Space Bugs(http://apps.microsoft.com/windows/en-US/app/space-bugs/df756f37-8bb6-4fc3-b240-219d829f0d29) to test out the market. It's been released for 3 days now and there are only 2 downloads - me and my friend. Yes, I didn't spend any money advertising. I thought that it would at least get several hundred downloads. I've released a few iPhone/iPad apps and that's always been the case. Has anyone been able to get traction without spending money on advertising? Any tips on where to get free or very cheap advertising?