Yes your level is fine for this part in Celestia. The Crustacean Empire is the last area in Celestia before the Chancel and the Trial of Spheres, you should be able to reach level 60 by the end of Celestia.
You will find out soon enough when it is time for the Crustacean Empire, if you are close to finishing up Celestia this is the last place until the dungeons of Celestia. You will be assigned a quest to go in. And any level is allowed in any world, maybe not any dungeon but any world as long as you have a friend to teleport to.
It's higher than most levels, but being too high isn't really a problem. I was totally unprepared when I entered the Crustacean Empire at a level 54 or so (can't really remember, around there) so it should be easier for you.
-Molly level 84 balance currently on Alto Alto in Azteca
Yes your level is fine for this part in Celestia. The Crustacean Empire is the last area in Celestia before the Chancel and the Trial of Spheres, you should be able to reach level 60 by the end of Celestia.
That is your decision if you are ok. If you struggle, work on side quests. If you feel comfortable then you are fine. There is no right or wrong level to be anywhere, you take it at your own pace.