Daisuke 'Pixel' Amaya, the creator of indie retro throwback Cave Story, has been at work on another game since February. Entitled Rockfish, the game is destined for iOS only.
Amaya is taking fan feedback from Cave Story into consideration for the project. One of the biggest changes known so far is the expansion from one save slot to three. Little is known about the outside the screenshots, which show off a shop and a little fish dude swimming through something similar to Mario's underwater levels.
We can't wait to learn more about the game, and we'll be sure to update you as soon as we catch more info.
Source: Pixel's Blog [via Destructoid]