Do you miss the Nintendo Game Boy era of portable gaming? Does anyone? Crescent Moon Games is banking on an affirmative answer with its new platformer, the monochromatic 2-bit Cowboy ($1), which certainly does look a classic Game Boy game. Your taste for the game’s look will be determined by how much greenish, pixelated nostalgia appeals to your own eyes. Players start the game by picking a cowboy or cowgirl and they’re off, thrown into…