Overall, I'd have to say I'm disappointed. I was level 16 when I finished-- I had no real problems with it except for a few *major* frustrating sections. In 8-4, if I hadn't been in the last level I would have turned it off and never finished it. After the credits roll, you can go back and do some sidequests. I checked into them online to see whether I wanted to bother and found that some of them aren't recommended unless you are level 40.
And there's the part that I hate. This game is a platformer. Sure, it's also an RPG, but the idea of grinding in a platformer because my stats aren't high enough seems foreign.
So yes, I had some fun, and I would recommend it to anyone, but there were so many missed opportunities.