Pac-man Monsters (it's a monster collecting/puzzle rpg) is my current time killing mobile game and so far I've only found one Klonoa reference. The animation fo using a Pac-ball (super attack that isn't actually that super) includes the names of a number of Namco franchises in the background, which all merge into a giant Pac-man that goes and wrecks your enemies (but not the strong ones). The game also has characters from other Namco games as monsters, but I've only collected a quarter of the monsters in the game so far and haven't seen anything Klonoa-related.