Pixel art for a dark 2D side-scrolling action game set in...

Pixel art for a dark 2D side-scrolling action game set in China's Three Kingdoms era, around 200 AD. Muted low-saturation palette of dark blues, slate greys and earth browns with very small dull red accents. Large crisp pixels, flat shading, no characters, no people, no text, no UI. Background sky layer. A cold dusk sky, deep blue above fading to a dull orange band along the horizon, a few thin clouds. Along the lower half, three layers of distant mountain and fortress ridges fade into purple haze. Nothing stands in the foreground and the bottom edge is plain mist.