My iOS game SEO

Hello, I have been a BHW user for about a year and I dreamed of having something online that makes money.
I read a lot of posts on BHW to choose the right niche but could not think of one. Since I have some experience in programming, I decided to work on an iOS game(The name is "Bamboo Bridge") and the game went live on the App store few days ago.

But I don't get a lot of downloads and I do not have money to buy ads on social networks. I searched on BHW for iOS app SEO ideas but I could not find one.

Should I create a website and apply the knowledge that I learned here to advertise my iOS app? Any idea? Or very effective way with small investment? I can spend upto $50.

Seo should be out of question if you can't afford paying for ads.

Thank you for your reply. Then any effective way to advertise with small investment like $50?

Jv with someone who can promote your app ( if its worth promoting) and you can share your profits accordingly