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. Three separate objects in one row with wide gaps. First: an iron floor trap of long spikes, seen from above at a slight angle, spikes retracted. Second: a stone floor vent with a soot-blackened iron grate, seen from above at a slight angle. Third: a heavy iron-bound door seen from the front, closed, set in a stone frame. Plain magenta background (#ff00ff) and nothing else. The background is one plain solid magenta colour (#ff00ff) with nothing else in it, for chroma keying.