Once upon a time, Cave Story (Wii and DSiWare versions) developer, Nicalis, had a game titled Night Sky in development for WiiWare. Night Sky is an action/physics puzzler. You can watch a trailer for it below:
This game game is being developed for the 3DS, to be released on the Nintendo eShop at some point, Nicalis have announced via their Twitter feed. The fate of the WiiWare version is unknown.
In addition to Night Sky, Nicalis are also working on one other eShop game, which will be released at a later point.