I couldn't get past the first 18 or so coins, because having to click in mid-air was too hard for me. And dying doesn't reset your score, so I can't even know for sure how many different coins I collected and how many were just the same ones after dying. And getting stuck and unable to move, having to jump around to get unstuck, I think that's fairly annoying, even if it's not that hard to get unstuck. I think the music is nice though, although a bit short. And I'm not sure the coins pushing you back is that fun. Sure, it connects the "collect stuff" rule to the "there and back" theme, but having to collect coins and bring them back somewhere would have fit it just as well, and would probably have been more fun.