Martian Dreams is built on the same game engine as Ultima VI. Much like that game, it is much less of an RPG and more of an adventure game in which you are wandering through the world, talking to NPCs, and combining objects to solve puzzles. You're not really building up and customizing your character here. Sure there's combat and leveling up, but it doesn't really feel like it matters much.
The most important part of this game is the story and the world it's built around. Martian Dreams takes place a fictionalized the late nineteenth century setting in which space flight is a reality. Dozens of historical luminaries from the era have all been accidentally sent to Mars and it's the player's job to find them all and get them back home. Along the way the real-life talents of the characters will come in to play: George Washington Carver knows botany, Louis Comfort Tiffany know glass making, and Sarah Bernhardt knows, um, stage make-up. The only human villains are the evil monk Rasputin and the anarchist Emma Goldman.