What is the most technically impressive Gameboy Color game? (Day 5) + GB Final

Board 8

Cavedweller2000 posted...
Resident Evil, although I'm not sure it counts as it wasn't released
Initially, I would have banned unreleased games, but because everyone was pro-Star Fox 2, I relaxed the rules, so unreleased are fine, as long as they were made by a real company at the time and not some indie weirdo twenty-five years later doing things as a joke.
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Started: July 6, 2005