From the press release:
About Ontamarama:Hey, I wanna be an Ontanamaestro! An Ontamaramamastermaestro! And if you don't watch the trailer, at least watch this... stunning Japanese advertisement for the game.
On a peaceful tropical island, Ontama roam free. These gentle sound spirits, when properly conducted, offer the people of the land a beautiful and enchanting symphony. Wishing to rob the inhabitants of this joy, an evil demon begins to control the natives into capturing the Ontama. Two aspiring “Ontamaestros”, Beat and Rest, discover the plot and decide to foil the evil demon’s scheme by challenging the villagers under the demon’s control in order to release the trapped Ontama!
Key Features:
• Fast-paced music-based gameplay that challenges the player’s reflexes, timing, and concentration.
• 12 stages to play, including a tutorial, each with their own catchy melody to master! Each successful challenge nets the player “Ontama Points”, which can be used to unlock new songs, items, and Ontama styles!
• Story mode with three difficulty settings that tailor the game to gamers of varying skill levels.
• Freeplay and Challenge modes offer excellent replayability, allowing favorite stages to be revisited and offering greater levels of difficulty for skilled Ontamaestros! The more you play, the more you can unlock!
Bonus info: I think ontama is also a food that looks, appropriately, like this: