If you think this is a space physics simulator, look elsewhere.
The game itself has moderatly complex controls that REALLY shouldn't be there by default. Solar 2 trys to achieve great things, it has a good set of levels and mechanics. The mechanics, i would say are unique and annoying. Objects would sometimes not lock (Again, this isn't a realistic physics simulator if things magically lock in place, not saying that they claimed that it was).
The levels are pretty hard to do, once you figure out that you have to drive around space with 8 hard to control planets crashing everywhere. It was fun at first, but got boring after a couple of hours. If they were to improve how things work, this game would be a great one.
The soundtrack is pretty fine.
This game isn't worth $10. It's worth getting when it's under 3 bucks.