The only thing that could be better is that almost every cute item costs much real life money.
My suggestion:
There could at least be a rare chance of getting c-coins. Like, one can spin a wheel of fortune by paying 250 smilepoints with a chance of common login gifts and a very small chance of getting one c-coin or in another slot of the wheel maybe an fresh shop item or 10 charge drinks, but so, that the chance to get one of these is way lower than common login gifts. This would also work with a gaming machine.
Or maybe there could also be a minigame which one can play once a week with a small chance of getting 1-2 c-coins but rather common rewards and XP.
The rest is cute and fun though also the music
Yumenoki about CocoPPa Play, v1.9.3