Not only does the game involve tapping directions on the D-pad rhythmically while circling blobs on the touch screen, it also involves blowing into the microphone. For something that seems to be for young audiences, it certainly has a lot going on. Also possibly of interest: J-pop fans may (or may not-- we have no idea!) be pleased to hear that Ontama contains music from a group called 80 Pan.
And, via Insert Credit, a little background on the developer Noise Factory: they used to be an internal SNK team who developed fighting games for the Neo-Geo. The fact that a fairly hardcore fighting game developer is working on this is another reason to think that quality gameplay might be found in here.