Thanks! Yes, they're mine. I'm just a dabbler in pixel art as well (painting and sketching is more my thing).
I'm creating an adventure game engine on Teensy, and the aim is that this is the test game. An iconic scene from "The crab with the golden claws".
The display engine is a mix between vector, sprite and overlaid effects, like lighting. This is just a still (Photoshop) that I'm hoping to re-create in the engine.
The engine supports pixel up-scaling, so the display is 320x240 but each pixel is 4x4. That means it uses a 80x60 pixel screenbuffer, using only 10k RAM instead of 154k RAM.