create retro style 2d game environment pixel art

Create a retro-style 2D game environment with pixel art details: a flat, grassy ground, a single tree with pixelated leaves and trunk on the ground, a background showing distant hills or subtle city skyline, a ladder leading to a raised platform on one side, and a clear blue sky above. The scene should have a vibrant color palette typical of classic 8-bit or 16-bit games, with nostalgic simplicity and clean lines, making each element visually distinct and easy to recognize.