You might like Mushishi. Mushishi is darker and it has the episode-of-the-week thing going on and I could name a million other differences but sometimes it still feels similar. I bet Ginko and Alpha would get along.
Ashinano also wrote a few shorts you can download from http://www.cafealpha.org/
. He's currently doing Kabu no Isaki but I think he only does a chapter every few months. Which is almost as slow as the Evangelion manga so he should be done in about 20 years.