is there companies/publishers for sponsering small mobile games , and how do they work ?

so , I have this game , it is a 2d platformer puzzle game , not the coolest thing I agree but it's somewhat a complete game , now the problem is I don't have the budget to advertise the game or make a campaign for it , is there something like companies that sponser or promote the game for certian share of the game or something like that ? , btw the game is already on google play