Mr. Sumney is, I'm sorry to say, not dramatically variant in the indie folk sonic system. I would say that it is a somewhat more electric orchestration of someone like Jesca Hoop; the sonic textures are similar. I don't care for falsetto - tastewise - I've run into a few other groups that are similar sonically over the past half decade besides Ms. Hoop.

It's plausible Mr. Sumney will evolve for a time and be substantially different - Doomed from that video presents the possibility unambiguously - but musically I would locate him in the indie-folk sound, with a different instrumentation and more electric usage.