A vibrant and dramatic cartoony scene suitable for a Steam game thumbnail: a knight in a silver armor covered by a flowing blue tunic adorned with sun emblems, standing heroically on a cliff. He is gazing at a vast, ruined citadel in the distance, crafted in bright shades of yellow and stylized with exaggerated features. The desolate landscape includes whimsical greenery and soft curves, under a partly cloudy sky with playful, dynamic lighting. The overall atmosphere is adventurous, colorful, and reminiscent of a metroidvania-style game world, with a distinct cartoon art style.