The game gets easier the further it goes, because you have fewer cows to protect, but the number of meteors does not (seem to) increase. Once I got down to only

The game gets easier the further it goes, because you have fewer cows to protect, but the number of meteors does not (seem to) increase. Once I got down to only two cows, I didn't have to do anything to protect them in certain rounds, because the meteors just missed them.