Not quite there yet, but this game has some yearly updates "X years of development". 13 years at the moment. http://www.zincland.com/powder/
I had this on my DS. Didn't know it was still being developed. Thanks!
Not only has he been maintaining POWDER for that long, but Jeff Lait has also been putting out 7-day roguelikes annually for most of those years as well, including Fatherhood: http://www.zincland.com/7drl/fatherhood/