would be nice if the level select screen would show the butterflies you collected, i didnt realize collecting them added to game completion and had to search for the ones i missed. also the script error after level completion, starting on level 10, was super annoying.
-edit: i didnt realize you had to catch them 3 times in order to collect them.

I like that the butterfly's position doesn't reset upon death.

Im getting this quite often after finishing a level:
An error occurred running the Unity content on this page. See your browser JavaScript console for more info. The error was:
uncaught exception: abort(116) at jsStackTrace ....
Then the screen freezes. Using firefox.
edit: Game doesnt save.

love it ... refresh my page with complete lvl is bad omg no finish lvl 16

The game is interesting and challenging, with pleasant music and neat graphics. It shouldn't be that much challenging on earlier levels.
It might also use some more hints, because I don't really understand the purpose behind the butterflies and multiplied hearts.
There's also a script error occurring after almost every level, leaving us with a black screen and music playing until it ends, where nothing else reacts to the control keys. You should look into it.
The medals' mechanics are probably a little broken too.
Happy Singles' Desperate Chocolate Consumption Day.