Theme Explanation
Shiv is a stealth game all about staying hidden in the dark from invisible shadow monsters that snuff out the light around them, with the unique visual style highlighting the contrast between light and dark.

The limitation I was shooting for was Limited Palette, the game only ever displays two colors at a time, using quantization and dithering to blend them together (though an array of palettes are available to choose from, only two colors are visible at a time).

I did realize after that by virtue of being a stealth game, this could fit the "Additional Theme" limitation as well.