At the moment, these 2 titles come to mind:
1) Irozuki Tingle no Koi no Balloon Trip:
This one is a quirky and funny parody of the Wizard of Oz, full of absurd characters and ridiculous situations.
The protagonist is a 35-year-old geek with no job, no money and no girlfriend who spends his days watching television. One day he notices an advertisement for a "miraculous" manual that can make him irresistible in the eyes of women. He orders the book, but a moment after opening it, he is sucked inside and transported to an alternative dimension, where he wears a green elf suit and is called Tingle.
2) Chōsōjū Mecha MG:
This action/3D-fighing game involves driving a series of transformable robots (MGs) and performing various missions by moving to different locations. A myriad of different robots are available, each with their own characteristics, merits, and weaknesses.
In the lower screen is the cockpit with its own controls, levers, buttons, switches, cranks, steering wheel etc. and it is fun to use the stylus to maneuver, even in an awkward and approximate way, the MG jumping from one command to another, charging here, rotating there, pressing this, pulling the other and then admiring the effect produced on the beautiful 3D graphics on the upper screen.
What do you others recommend?