http://www.tinsanity.net/ikachan/Ikachan is a short cute little platformer. You play as a squid that somehow ended up in a place in the ocean that... I won't spoil the game. It's quite short. You can expect your first playthrough to be only 1 or 2 hours, and subsequent ones to be much shorter.
And before you ask: Yes, it was made by the same person who made Cave Story.
Also, I call dibs on mapping it.
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Dot? Dot. Dot!