How high can you level up?

Each skill has a different maximum. I think Level 31, for Combat, is the highest... although I'm not sure, I'm only saying this because I'm at level 30 with one combo move left to unlock.

It takes about the same amount of work to max every stat, though: quick example is that hedgehog stats max out at a low level, but you have to fill the experience meter 50 times over for the final level.