Same here. As with Cave Story, these are both great games which are under a megabyte but last a long time. Even now, this game is so popular that it has an active forum talking about it and its own tribute site.
I loved how simple the game was personally (one button gameplay). While I love Cave Story (one of my fav games ever), some people who I recommend it to, who are'nt avid gamers like myself,often complain the controls are hard to get used to (without the aid of a gamepad). In Ikachan, everything is pretty much done with one button, yet the game was kinda complex. IMHO it was beautiful in its simplictiy.