It's too easy to accidentally hit the power ups. I just did and now I have a ribbon next to that level even if I solve it without the power up. There should be a confirmation or something to be sure you really want to use it - especially since the cat can fly behind them and the only way to extricate him (this is how I did it) resulted on using the power up.
Now I don't have any so should not be a problem but it is with that stupid ribbon. Unless that was something GOOD to have and now I have to get them on all of the levels.
The cracks for the costumes are a bear to find. They need to be a bit easier unless you really are doing that to encourage IAP - you aren't doing that ARE YOU??? Nah didn't think so - so make the cracks easier to find.
And finally, you do have to get all cupcakes in one go to have them register? They go away if you get them and leave the wrapper but they actually don't "count" unless you get all three? Why have them go away then? That makes it harder to get them. If you make them go away then they should be cumulative.