Other than the new characters and songs which are really cool, Unfinished Dream of All Living Ghost feels like a downgrade compared to the other games. The gameplay style of UDoALG feels quite gimmicky (specially on harder modes), the character balance is all over the place and it even lacks basic features like a scoring system or replays.
Being honest I'm not really sure of what will be ZUN's next step with the franchise after releasing this unfinished mess to the public.

Just play Phantasmagoria of Flower View man