It's good.
A few flaws, however.
In my opinion, the control is pretty bad. I mean, you can fly past the same coin 3-4 times before finally getting it.
Also, the arrow indication could be a be a bit better. Sometimes, if there's a group of coins near each other, you have slight trouble finding the one you're supposed to get. Maybe make the one you want shine or something? I dunno.
Other than that, it's a good, fun game.