Thanks for the kind comment!
Switching between fairies has always been a hot dicussion topic. There is an option for a single key switch in the options menu, one of the later levels explains it. The reason why it is not the default is because on my testings, players struggled with later levels when multiple fairies where around and precise actions where necessary. But it is true that it is cumbersome to press so many keys to switch with the regular system. There is no real perfect answer to the issue, only compromises and giving the player the option.
The levels climb in difficulties starting from Slumber Party. So if you found the first levels too simple, try changing the switch mode and give the later levels a try.
Fairies don't have a flying animation mostly because I didn't have time to add it. I'm not sure if it is necessary to add one, I'm on the fence about it. Some other animations are missing.