colony simulation game, RimWorld, optimal room size, spacious interior, 5x5 tiles, bedroom, wooden walls, smooth stone floor, standing lamp, soft glow, dresser, end table, double bed, plant pot, daisy, mood boost, temperature-controlled, vent, mountain base, overhead mountain, 3/4 perspective, detailed texture, realistic materials, ambient lighting, in-game screenshot style, high resolution, clean design, efficient layout.