Asteroid miner is a game which I made for a game jam. But its now available on mobile as well. You can play it on web with keyboard controls or you can download it on your mobile. In this game you have to collect asteroids. You have to doge the enemies or attack them with bullets. After you get 50 points a boss will spawn. It has 4 difficulties - easy, normal, hard and impossible. I have only won the game in easy mode. You can change the color of your player as well. 

Its web version - https://jkgamingc.itch.io/asteroid-miner

Its mobile version - https://jkgamingc.itch.io/asteroid-minermobile

A screenshot -