Looks like THISChris Double has released the first version of his Space Invaders homebrew game. It is not currently finished, as he still has some scaling issues (32 pixels on the right are off screen) but it is very playable with sound and all.
The emulator must be loaded from a flash cartridge. It can't be downloaded directly via Wireless Multiboot onto a flashed firmware DS. This is because he loaded the sound files and ROM directly from the cartridge address. So to run it you'll need it on a flash cartridge and boot via Wifime, PassMe or booting from a flashed firmware. Not downloaded wirelessly onto a flashed firmware.
You can get it in our Nintendo DS Download section here. (.nds and .nds.gba)
Controls:
Right Deposit coin
Left Shoulder Button Player 1 Start
Right Shoulder Button Player 2 Start
Up Move Left
Down Move Right
B Button Fire
Start Reset Game
Close Lid Pause and turn off screens
I wonder how it plays?You hold the DS like a book in tate so if he would include screen 180° flipping(so that you also flip the DS 180° and use the 4 action-buttons as controlpad and L/R as "shoot"-button) it would work pretty well IMO.