User blog comment:Maki Kuronami/Meanwhile in Japan.../@comment-3257939-20150901141733/@comment-10380701-20150902145231

In concept, Grim Eclipse is viewed as a doujin game by Japan.

However, once RT picked it up, it's no longer doujin.

Really, doujin is just the japanese term for indie, except it applies to multiple mediums, not just games.