We are the Dwarves is a game with decent graphics quality while not requiring particularly strong hardware to run. Any gaming rig from the last 4 years should perform well enough for a smooth experience. That interprets in a GTX 560 GPU or AMD equivalent coupled with an i5 CPU and 8GB of RAM. However you can get away even with 4GB.
With your party of 3 dwarven astronauts explore a unique dark world of endless stone where life is possible is only possible in great caves.