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That is all.
This game is amazing.
I have 25 stars and it's clearly so much better then 64 and Sunshine, and pretty much every Mario game except for Super Mario World IMO.
I've been playing for about 8 hours and I'm on the third uh....grand galaxy I think? I have all four of the five galaxies in it unlocked, but I've only been to two and I've only got one star. (in Beach Bowl)
The music is so good, and it sounds amazing. My favorite songs are the Astral Observetory and the Good Egg Galaxy theme. I just wish they used the Good Egg Galaxy theme in a few more galaxies, rather then just in one 
The voice acting (I don't count Marios yells and stuff as voice acting really) thats in the game is pretty meh (not as bad as Sunshine), but there's very little of it so that's good. There was so much voice acting in Sunshine and it was so awful, it pretty much ruined the game. (Never bothered to get past 20 stars and I doubt I'll want to ever play it again now that I've played Galaxy)
The difficulty level is rather high, actually. I had a lot of trouble getting used to jumping and controlling and the weird angles of the planets but then I got over it. Then about an hour after that the difficulty level suddenly jumps up!
I hate the Slingshot galaxy
. It took me so long to beat it and I died like 50 times, but thankfully there's a lot of ways to get 1-UPs in that level (I had 999 star bits by the end!) so I only got one game over.
I also cannot beat the surfing level on the first world (lost 15 lives and got a game over and gave up) and the Rolling Green level on the second world. From what I've noticed, pretty much all of the galaxy's with only one star are MUCH harder then the galaxy's with 3 or more stars.
But yeah, the game is amazing. Only problem is now I'm drowsy (only 5 hours of sleep plus that song in the Astral Observtory is like a lullaby to me
) and I'm not sure whether to play more tonight or get to bed early and play early tomorrow!