It's hard to judge Galaxy 2 without comparing it to Galaxy 1, however i think in this case Galaxy 2 makes the most impressive thing for a sequence of a game this good, that is to improve upon all the original mistakes.

Galaxy 2 level design fells flawless, even more than in 1, the movement is way tighter and way more interesting to execute, that's partially because the camera, while still bad, it's not a problem anymore, because the level designers put the default one in a way to always make your jumps works, and that makes a world of difference.

The power ups that were really bad on the original are actually good here, they are fun! Add a new complexity and layer to things, and now we have Yoshi! Somehow the Yoshi motion is not that bad. Hell, even the extra levels are better, because the platforming fells smother in the clone mario or speedrun levels, they fell like actual levels now, it's a long jump simulator but superb nevertheless.

I think my only complaints about this game are still the extra 100 purple coins that are a pain, the post game that this time has an incredible extra world but the prize is more repetition, the motion controls that are less but still a pain (the only five stars i left behind) and of course the lost of the heart of the Galaxy in Rosalina.

Still, as a platformer genre fan , the movement, the level design makes for a greater game, one of the best ones ever made.