Great! Love the name and the play on words used there and in some of the concepts like "power chords" etc, very clever.
Overall a very achievable game idea, and I really hope that you get to show off your art skills by getting cutscenes working (although if you don't there's still room for that kind of artwork in a menu screen etc).
I like the ideas: "
Execute musical attacks against enemies via keyboard combinations;
Allies may convert to zombies if in contact for long durations;"
However these may prove to be things that are done closer to the end of the project.
Document is well-written, and I can't wait to see what you actually make. This report makes me want to play guitar hero again, but I just took my guitars to the tip shop lol