Wow the protag is super duper cute. Shocking he can't find anyone to bang him. Love the little main menu animation and the swaying coin for the O—not sure the N's read as N's to me though.
All the animations and art are great actually. Big fan. Love the inclusion of all the concept art too.
IMO, hitsounds in a rhythm game that has them should be on a separate slider to things like menu SFX, but frankly the fact there's a slider for them at all and configurable latency puts this well above a lot of games that WEREN'T on a jam deadline. Much appreciated. Just wish there were some indication of early or late so i could tune it a bit better. I see you were planning on a calibration sequence so if you do spend some more tiem on this then that'll be a great addition.
Aside, i did find a very easy way to see the fail screen—just hold down a key. Godot will get you with those key autorepeat events every time.