Dee Dee Planet was planned for the Dreamcast back in 2001, but never saw the light of day. It was reportedly nearly finished, and developed by a web designer called Dori Dock. You can find an interview with the creator back here on the wayback machine, but more interestingly you can see some actual footage of the game. It’s very indie styled, so I’m not surprised it never came out…still, quite interesting. The guy making it said he’d never played videogames before. Curious!
Thanks to insert credit and Wraggster at DCEmu UK for the news.