My video game idea that I’m not going to make is Moby Dick. You are a gigantic carnivorous whale hunting giant squid and other prey in between boss fights where you completely wreck beautifully rendered 19th century sailing ships and then eat their crews.
There exists/existed a Flash game kind of like that: http://www.agame.com/game/moby-dick-the-video-game
It doesn't have boss fights and your idea is probably more serious than "Whale snacks sea food to grow big enough for snacking boats", but yeah, that was quite fun, too.
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