Red, red sand.
This game tickles my 8-bit bone in a lotta nice ways, the graphics are smooth but pixely, the music's almost got like.. if Pink Floyd had a NES game, it'd be scored something like this. A little desolate, but then again, there's not MUCH on mars anyways.
Gameplay's nice and challenging, learning optimum placement with the right units AND figuring which drone and equipment to load up, it gets harder with each damn new martian that arrives. If anything, the fourth unit's the one I can't get the hang of yet. Maybe I need to get farther
Great game though, definitely worth the gallons and gallons of time it eats up