When using the Arma Felix glyph not only will Shanoa be able to talk to the house cats in the village, but swiping the stylus along the bottom screen will materialize a ball of catnip that the house cats will be helpless to chase after.
On top of the water in the Somnus Reef all the way to the left of the entrance is a rubber ducky floating in the water.
Wygol Village reuses sprites from "The Lost Village" from Castlevania: Dawn of Sorrow.
Beating the game unlocks Albus Mode, which allows you to play as another character from the game named Albus. He cannot access the menu and has his own abilities, different from those of the main character, Shanoa.