Congratulations and thank you for trying multiple times!
If you got a taste for it now, I made another rhythm game a few jams ago that is less christmassy but more funny: https://ereborn.itch.io/undercover-dancer
You are right about the mouse vs keyboard. I think what I should have done was make all the dialog and interaction mouse-controlled and only the rhythm part keyboard controlled. There is a bit too much of switching between modes now. Not sure about making it fully keyboard controlled though, personally I'd not like choosing locations on the map by keyboard I think.