My party is only level 4 so far, but I'm already working on the follow-up campaign, at which point I expect them to be level 8. Looking over the spells a little, I noticed Paizo have done a few things to address the issue of potential game-breakers.
For one, some spells are listed as Uncommon. These tend to be spells that mean a change in game style (raise dead can be denied to make a permadeath game) or to allow certain types of adventures (zone of truth can be denied for a murder mystery).
Secondly, some spells that might cause GMs headaches have been moved up a level. Fly for example is a 4th level spell instead of 3rd. (Higher level creatures are more likely to have options against flying opponents)
Some spells have been restricted in some other way of what they can do or how easily they can be pulled off. Plane Shift takes 10 minutes to cast, so you can't use it to immediately escape combat. And some spells for locking down creatures have the Incapacitation trait to protect high level opponents.
Lastly, some "usualy suspect " spells appear to have been outright removed. No magic jar, for example.