Tips to increase Downloads

Hey guys,

Last Friday i published my first game with a pro and free version, 

but hasn’t even 50 downloads on FREE version!

I really need tips to my game be found :confused:

I don’t know what i did wrong.

Can does anyone help me?

That’s the game trailer:

http://www.youtube.com/watch?v=HUePTehok9I

that’s the link to Google Play: 

https://play.google.com/store/apps/details?id=br.Slingshot_Free

Thanks.