LOL, got a few former pro Gameboy developers here in the room with who enjoyed a chuckle at that :) They spent years trying to avoid those limits.
"DO NOT MAKE AN ACTUAL PERSPECTIVE 3D GAME UNLESS YOU ARE DOING IT FOR THE REAL HARDWARE IT WILL NOT WORK IF SOMEONE WERE TO TRY AND PORT IT TO REAL HARDWARE"
Fuck that. I do game jams for fun. I program games for systems with hard limits like those everyday.
Rules are resolution and 4 colours (preferably 3 progressively darker shades plus one unshaded) the rest is up for grabs.