http://www.kickstarter.com/projects/1035580424/blackspace-plan-dig-defend-survive

Blackspace is the ultimate blend of Action RTS and Defense formats without many of the restrictive and repetitive aspects of a typical tower-defense, or the confining perspectives and awkward unit management of a classic Action RTS. Blackspace's fully deformable spherical play surfaces, direct control of the environment, and extensive use of physics will make this an experience more organic and non-formulaic than any other defensive strategy game. By piloting a 3rd person mining craft around the asteroids, you'll be able to change your viewpoint from on the ground to high-altitude orbits, eliminating the frustration of prohibitive camera angles.