This is a game from Japan - and no, before you ask - it doesn't make much sense.
In this, possibly the very definition of a short game, you jump, slash and sometimes power-charge your way through three fast levels within the set time limits.
The tricks come in the form of your enemies - you have but one life to give - and your enemies appear from thin-air. If they materialise atop of you, there goes a heart. It is fairly ruthless in that regard, but the enemies come at the same points each play-though, so memorisation will allow you to keep your three hearts.
Along the way you'll notice a combo system. Typically two is the highest you can get, but by charging up your sword (the bar on the top-left of screen) and holding down the slash button, you can let off a mega blast, good for many combo hits.
It is only three levels long, and you only get on the high score board if you complete all three levels. That seems excessively rough, given any death you incur will have you starting from level one again.
In all, its a fine game, fairly average in terms of both pluses and minuses against itself, but it does give fifteen-odd minutes worth of entertainment.