Space Colony HD is a remaster of the real-time strategy game and base builder developed by Firefly Studios, creators of the Stronghold series. ItΓÇÖs a strategy game with depth and personality.

Does not open on my old iMac white using 10.6. Intel core Duo
Opens on my iMac Silver 10.9 Screens flickers, have to use 800x600 it does not flicker, could be the graphic card 8800 GTX.
Works on my i7  GTX 660 perfectly.

Tested on 4 Systems.  Might be different on yours, Maybe works after new install of osx, or maybe graphic card got bugged.  If it works on your system you can comment.

iMacWhite  - Intel Core Duo
             ATI Radeon 1600
             10.6x
             Does not open

iMacSilver - Intel Core 2 Duo
             GTX 880
             10.9x
             Must play in 800x600 so screen does not flicker.

iMacSilver - I7
             GTX 660
             10.8x
             Works flawless

iMacSilver - I7
             GTX 660
             10.9x
             Works flawless