It's a nice game
I love how polished it is. But as the reviewer below me said, it's just a generic game. Normally I don't mind this as long as the game is fine, but your implementation of mochi coins is what threw me off.
This game's just a small project if I'm not mistaken, players will probably never play it again after the first time, selling items for real money will put players off.
You should have just made those bonuses purchasable with in game score or points.
Good luck with your future games though!