Meh, you have to do too much repetitive stuff to get enough money for the upgrades that are never worth buying. Spending 200K to be able to fight an underground worm and then get a 2000 credit reward after a several minute boss fight = fail. Dunno if i want to spend more time doing the boring part to get the golden cart.
IMHO, too much pixel-hunting (TIM never really had that problem by the way), oh and too many obstacles can be bypassed -check out lvl 25 for instance, where you can just place a concave to lead the ball straight into the bucket.
Oh, now the badge showed up.
Also, the easiest way to do it is in lvl 1 - just dump all the other colours in the corners and trap the flier with purple several times. You can kill off the duplicates to avoid getting swarmed - or not.
Duplicating shapes - when you trap a shape (an enemy) in a block of the same colour (e.g. you have a purple flyer and you trap it in purple) your enemy gets duplicated. I duplicated 4 and didn't get the badge :(
I found most to be pretty easy, except for 10 where I had to cram a little in F1. The trick is to use F1 to jump 1 cell further than you think you need to jump to. And in 11 I simply used F1 to go forward 4 times and light up, F2 to do both rows. In main all I had to do was call F2, jump off and turn - and repeat 3 times.
Hint: you get 1800 even if you crash. Get all upgrades, hit the poles perfectly, as soon as you're airborne do a handstand and align the rockets at 90 degrees. As soon as you reach the starts, do a flip and (optionally) balance and land