would change artist field to ぺぽよ feat. 初音ミク as "Any form of feat., feat, ft., etc. must be written as feat."
would remove the audio track from the video as osu! doesn't use the track from the video, also it can help save file space
even though diff names are different than normal, i dont think you need the difficulties for each diff in the tags, up to you if u want to change