It's fun. Perhaps look for a sale but I don't see why you shouldn't play it.
Absolutely. If you like kawaii shit
If you want a shitty chibi dating sim then sure
Otherwise you should be playing the better rythm games of this gen. Hell technika tune and project DIVA f is alot better than this game. The graphical fidelity and build quality of the device simply isnt there on the 3DS for good rhythm gameplay.
It's just a whack experience playing rhythm games on 3DS in my opinion.
Pic related is $28.28 on amazon right now.