Absolutely free with zero in-app purchases or ads!
The life of a mineral prospector... IN SPAAAAAACE!
Use your device's touch-screen capabilities to guide your prospecting space ship to safety. You'll need to avoid killer asteroids while you do, and keep your ships from crashing into each other as the difficulty increases. Choose to control up to three ships at once, whether you're a muti-tasking captain or you've recruited the help of some friends.