I recently downloaded Mighty Switch Force onto my 3DS. I very much enjoy it. Though I wish it were more of a full title... mix in a little metroid powering up and progression... I'm a sucker for pixel art.
I took some liberties with the design, the biggest of which was making the bill on her helmet transparent like a Gatchaman helmet.
The game is from WayForward and is like 6 bucks. Give it a shot! Nintendo download doesn't have much else going for it.