I don't think this game is very bad, nor the reason why the franchise died, but it is honestly a bit repetitive, and not taking as much skill as vib-ribbon (a rhythm game) makes it a lot less engaging, pretty much the only optimization is trying to get all the characters as fast as possible. I get this game is a sequel to a 28 min long PS1 game but this is just so simple it feels so wrong for what a vib-ribbon PS2 game could have been. There's not even really any cool easter eggs with Vibri. I actually got the custom picture feature working on a real modded PS2 with an old Sony Cyber-shot Camera and it's nice, although obviously you can't send them through e-mail nowadays, sadly. And forget about emulating such features on PCSX2

It's a very cute game and it's nice to see another game with Vibri, and must have been fun if you were a japanese gamer in the 2000's, but it's a lot harder to enjoy nowadays.