Pushmo is the best game on the eShop. Gunman Clive is good too, and cheap. Liberation Maiden is fun if you like silly Japanese stuff but really short. Crimson Shroud is good if you like pen and paper RPGs. Sakura Samurai is a neat game too.
This. It's also worth pointing out that there's really very little else in the eShop (not counting maybe five VC titles) worth looking at beyond these.
"And you see where that can lead you, into what mistakes and absurdities, when you are dealing with a man like Arsene Lupin."