Created in 2000 by Amaya (better known by the pseudonym Pixel) - 4 years before Cave Story, perhaps his most famous work - Ikachan focuses on the exploits of a squid who swims through the Ironhead's realm, looking for a way out after a series of earthquakes.
Nicalis - which ported Cave Story to Nintendo formats recently - has previously stated that it is looking into bringing Ikachan to DSiWare, although the system shown in the teasing tweet is a 3DS XL, which suggests that development - if it is even still happening - may have switched to the 3DS eShop.
(Of course, it could still be DSiWare, as the 3DS is capable of running that, too.)
Would you support a conversion of Ikachan? Let us know in the comments section below.