I actually had it and played it for a while, it is very simplistic fun but..not amazing by any means. I got it for 5 bucks and got some solid fun out of it but it wasn't revolutionary by any means.
It hails from the "all games must be fully stylus" era of the DS, so none of the buttons do anything. Everything (jumping, UT, attacks, ranged attacks, dodge, ninpo etc) are done with the stylus, which goes surprisingly well I have to admit. I rarely got a wrong input, but it could get really messy.
You also unlock Momji later-on.
The bosses are...a mess. Most rely just on the bow turning the game into a sort of ... time..crisis almost. Really hard to describe. If you can get it on the cheap, by all means give it a whirl. It is a fun experience but don't expect a deep game or anything.
Fun fact: Itagaki made this game as a promise to his daughter, who was a big DS fan and wanted to play a game made by her father on her favorite system.