I just finished a game for a 1-bit game jam, requiring the use of only 2 colors . Slime's light is a small puzzle game that uses light and shadow to activate and deactivate doors and lamps. Unfortunately, I had to minify the code to make it fit into a single cart. You can access the unminified code on the itch page.
Controls:
Arrow keys - move
X - pickup / drop
Z - slow movement