I know I gave a little feedback the other day but I really wanted to write a full review out of respect for how great this is and how much work you put into it.
Knowing that you're planning on potentially continuing it I wanted to put in my personal opinions on stuff. I get the video game voice thing is what you're going for but I found it cut into my ability to hear the notes. Could be a volume control issue or could be the spacing. Maybe look into ways to harmonize the repetitive voice with the backtrack. So the still make the same sounds it's just songlike.
I mentioned how I found the staging was flat, and there were opportunities for good cutaways or 'cutscenes' that ties in with the same game formula. Your FX and Character design were on point. I REALLY like the villain and his vehicle. It's a super cool design that I could almost see as a toy or something.
I think over all you could get some more appeal with very little effort. Like small background loops to just add a little extra motion repeating assets so it's not a massive undertaking. I am interested to see whether you stick with the current 'ui' or not but looking forward to episode 2!
PS: that guitar lightning was freaking sweet
EDIT: So I realized you did do the background loop stuff, I think it mostly got overshadowed by the text boxes, so maybe take that into consideration with where you put effort on loops. (like animate around the text boxes so your work doesnt get obscured.