"I tried to convey that it's ok to make mistakes, that you're supposed to make mistakes"
I completed A2 with one mistake and on the level screen it had 2 icons. I completed it again with no mistakes and had the same 4 icons as A1. That communicates to me 0 mistakes is some sort of achievement and I should aim for it on every level.
I don't comment very often, but I had to say something about your latest update:
1) You made a double reference, that's a good thing and anyone who had a problem with it should've been ignored.
2,4,5) All good changes, those levels were tricky and players shouldn't have to choose between cosmetic changes and meaningful upgrades.
3) Did you have to change that right after I finally managed to deliver all the ice cream? ;p Seriously, though, Hard badges are supposed to be hard. Before I finally managed that one I was resigned to the possibility that I might only get 20pts out of this game and that's not a bad thing to have happen occasionally.