Space Station: Frontier – Amazon Appstore for Android – Free app of the day

A deep space mining operation should be a peaceful job, but no such luck in this quadrant. Defend your mineral-rich workplace from resource-greedy aliens! Mine asteroids, harvest energy, and build defenses to survive the alien onslaught. Story-based campaign mode and freeform endless modes.

Get it here
http://www.amazon.com/mobile-apps/b/ref=topnav_storetab_mas?ie=UTF8&node=2350149011
http://www.amazon.com/gp/product/B006H8BIIM?ie=UTF8&ref=mas_faad