Looks really nice, I wonder why there hasn't been a project with this exact name and functionality before. When I think about it, "git bug" is quite limiting (the bug vs. feature discussion).
Naming things is hard, but I can see that it might feel unnatural to use "git bug" to track features. Maybe that's totally okay because it does one thing - tracking bugs - very well, and the whole feature roadmap is living in another system/process anyways?