Critter Crunch, is working on Heartbeat for WiiWare. The title is the company's entry for the 2010 Independent Games Festival and is described as being about the "experience of growing sounds." Heartbeat's game description explains it has players starting with an "ambient whisper" and growing the "music" there, which we remember being the idea behind Electroplankton -- an idea that may or may not have manifested depending on how one feels.
IGN describes the game as involving the use of the Wiimote to control a "heart-shaped cursor," which triggers sounds, activates objects and keeps the beat going. There's no word on a release date. We contacted Capybara for a video of Heartbeat, so we could wrap our eyes around the game's concept, but were told the game isn't "together" or "stylish" enough to show at the moment. The dev hopes to share something in a couple months.