they have galaxy at gamestops and ebgames. go play it. this isn't a demo, this is the full game. here are my impressions:
first off the game is great looking. the upgrade from 64 to sunshine was good, from sunshine to galaxy is great. from the cut scenes to the actual gameplay it was a great game to look at.
gameplay. three-dimensional platformer. the first planets you come to are small. really small. like fit in the whole screen small. and the camera doesn't shift view to account for where you are. oh sure it follows you, but if you are running upside down chasing a jack-a-lope the camera doesn't turn upside down.
pile-driving through planets and coming out the other side is cool, btw.
the first move you get (WARNING: this may sound familar) is a spin attack. simply shake the controller and you spin, knocking enemies over. then you just run into them to finish them off. there are still gumbas.
bowser's airships are bad-ass.
the controls are easy so far. the stick for motion, the A button for jumping, the B button to launch these star thingys, which admittedly i hadn't figured out what to do with yet (I was too busy chasing bunnies). you can push down on the d-pad to get the first person look around view.
for the most part, i can't wait for this game to come out.