Wennis, thats odd, I was on about level 38, got the easy badge and the card handed to me, now on about 61 or so amazing how much variation in tactics this game has despite its simplicity. 5/5
flyers at 70, try building about 2-3 ice towers in close to your "swarm tower box"
i usually build a booster tower (or what ever its called) right in the middle and swarms around it, first two directly above and 2 to the left, (along the center lines) if you still cant get them, alevel 5 snap towers will stall them long enough for your towers to make short work of them.
if you swim around collect lots of fish behind you then reset and jump straight out of the water, you get a "schools out" bonus and a big speed boost right at the start.
ok try swimming around abit let all the fish gather up around you then, restart and jump straight out of the water, for a schooled bonus. still cant get stupid badge