So far, leveling up has been simple. I open a chest, I get a star, I level up a stat.
I'm a little worried thoug. I've only been able to find 2 stars per Kingdom thus far. After having just finished the Candy Kingdom, I'm a little worried that I won't be able to collect enough stars to level up completely before going on to New Game+.
Are there enough stars to allow for maxed out stats?