If I had to guess why they did that, they probably were tried of seeing people get perfect scores. This same concept applied to another popular music game called Osu!. I mean. Check out "Centipede osu!"
There's a PC port (unofficial) OSU droid evolution which is basically the same as PC but I like mobile more because it's portable/ it has a mp3 player for your phone also and I actually have no room to use a tablet/mouse comfortably if I wanted to play pc (no desk). Been playing for like 5 years lmao but I guess it's not spread around enough
holds can be done if your tablet has 10 point multitouch. although most androids limited at 5 points multitouch (even there's a phone with only 2 points multi touch)
Lol pure evil, they give you the four musketeers, and even if let's say you ever got that perfect, hot damn, they still insert SIKE notes after to juke your ded ass. Son of a becheth wanted pain for supper.