Those were the rehashing of ideas at their worst. Earlier in the game, you're also dealing with repeat ideas that the first galaxy had and didn't take any new spins on or anything amibitious, such as "ice meets fire" (twice may I add), a floating beach level, the pathetic bug stack thing being a boss, a petey piranha monster with asses as weak point, a large robot themed after snifits, a bee-themed galaxy with Honey Queen in it, rolling ball gimmicks, Bowser Jr. using machines that have cockpits as weakpoints, a planty, sky-themed galaxy with the sameish music as gusty garden, and probably more that im missing.
That's not to count the sheer amount of filler stars such as the Green Stars, the chimp, the boss/enemy gauntlet galaxies, and the gimmicky motion control bs as well. I know that Galaxy 1 had its share of filler content but you'd think Galaxy 2 would address them as well; it doesn't.
Yeah, Galaxy 2 had some neat new ideas but it was far and few between, when the game constantly reminds you that you can be playing a far better experience instead and how pointless this game felt.