First of all, I like the melody of this track and there is the potential to do something great with it.
Reminds me Akira Yamaoka's work a tad.
However, at first sight, I think the guitar sounds a bit rough. Have you tried with an acoustic guitar or different effects ?
But this is only my point of view. I can take it back and put it in my butt
To answer your question: yes, I think that can easily do the job as an opening theme once finished.