"Play as Johnny Platform himself in this retro-styled platformer! Do death-defying double-jumps and solve puzzles in your quest to defeat the evil robot army... and don't forget to drink plenty of coffee along the way."
Johnny Platform is, in fact, a homebrew DS platformer created by Ishisoft, now "ported" to the XNA platform.
http://ishisoft.remakes.org/sub.php?num=0
It's vertically orientated, so it hasn't changed much from the DS version at all. It does include a lovely side-view mode much like Ikaruga, so you crazy people with monitors you can set vertcially can play full screen.
I'm at 51 of 55 levels and the puzzle platforming has been pretty fun. 51-55 are a bitch though, it's gotten hard :lol
The game is 200 Points On XNA, you can download the demo here:
http://marketplace.xbox.com/en-US/games/media/66acd000-77fe-1000-9115-d80258550153/