Alright. So far the overall aesthetic is decent, but the actual fight scenes are far from metal. I was kind of hoping the combat would be something like the final scene from Knights of Badassdom, some badass singing bringing the monsters down like a proper metal artist, but unfortunately it's just be single-strum instances of the "god of thunder" lightning skill.
That's honestly lame as fuck, making it seem like he has no other musical skills - which is obviously false since he was holding a concert before he got isekai-ed.
I hope it improves.