The incredible gameplay combined with the outstanding levels makes for an excellent game.
As you follow up the story you will go to different planets to find stars to let the observatory fly again. You go to different galaxies and planets through domes used to watch comets and from there you fly to planets seeking stars. The last galaxy of each dome is usually Bowser Jr.'s and you fight him and his robots or minions. You also fight Bowser 3 times which is usually extremely fun and epic.
The biggest twist of the game is that this time Mario is in space and over there he reunites with the Toads and Luigi(but not Wario) to form a team of Lumas, Mushroom people and moustache guys. How fun can that be? I can tell you quite a lot! This game is by far the cutest because of the cuddly and wuddly Lumas. They are sooo cute and they ask for star bits which is supposed to be their favourite food. In the game, you collect a lot of star bits by aming your cursor towards them. You can also use the star bits as weapons by throwing them at enemies by pressing B. Rosalina(the mother of the Lumas) gives you a power of spinning to fly to other panets by spinning your Wii Remote or your Nunchuk. These two are your only forms of attacking enemies. It would be better if Mario was able to kick or punch but everything can't be just like you wanted you know.
This game is a lot of fun and is one of the games you will remember for years to come. The best part of Super Mario Galaxy is the colour and contrast of the game. It is so beautiful and is eye catching,