Well... I liked the game, except the planet concept got a bit annoying. A lot of the time I wished I could play more on wider and larger flat surfaces instead of tiny individual planets in space, each with their own gravitational pull. It got tiring after a while. Because each level layout has all these individual planets, the terrain almost felt exactly the same as the last level.
And this game is very linear. To unlock the next stargazing "room" which contained two new levels, you have to gather a certain amount of stars from the levels already available to you, defeat the boss, and then you got to go to the next room and do the next two new levels, or go back to the levels before and gain 1 or 2 more stars from them. It felt like the game was a preset order for what you do.
Mario's movement felt a bit stiff. You couldn't do a triple jump unless you were at full running speed, the spin attack felt quite stiff because you slowed down when commencing it, and sometimes over anticipating when you were going to hit your target and end up getting hit yourself instead, and I felt like this move had been ripped off from earlier games (Crash Bandicoot anyone?). And I felt like Mario's running speed wasn't fluid enough.
Also, the main hub is tiny. Remember Princess Peach's Castle in Super Mario 64 where you entered levels by jumping into the portraits? Or in Super Mario Sunshine, Delfino Plaza was pretty big too, and you entered levels usually by jum