It's ok so far. I've only played the 1st level though. First of all it's like EBA and ouendan where you tap to the note there are two differences though. First when there are notes that have 1,2,3,4 etc, you touch and slide it on beat correspoding to the circle unlike EBA or Ouendan where you just tap it. The 2nd difference is there will be a DDR sequence where the notes will come in a ddr style gameplay and you just touch the note that goes in the circle. So really it's an ok game.
"Seeing is only just an impression, playing is believing." -Nintendo
While it's not the greatest, it is one of the better Looney Tunes games to come out in recent years since they keep it simple, fun, nostalgic, and the songs are nice and varied as well as fitting into each level very nicely.
I finished the game in one day. T T Anyway, it was fun to play.
For the unlockables, you'll get more songs once you finish (pass) some certain songs. I got total of 18 songs but I'm not sure if there are any hidden songs or not. (I got rank "C" for most of the songs. Wonder if there'll be something special if you can get rank "A" or "S" for all of them.) Then, once you finished all songs in Maestro mode, you'll unlock Looney mode which is more difficult. (But not too difficult. A lot easier than EBA, I think).
By the way, my cheat submission in the Code page is wrong. You only need to finish Maestro mode to unlock Looney. I just sent a correction to Gamefaqs so it should be corrected pretty soon. ^_^
The game might be easier than EBA/Ouendan in terms of just passing the songs, because the error tolerance is big, but its incredibly harder to full combo the songs (S+ rank). Actually, A is hard enough for many of them. S requires a LOT of pratice and S+ is just crazy to get.