Tosh-ds has released an early demo of his Choplifter game for the Nintendo DS:

Right now I'm working on a Choplifter-clone for Nintendo DS.
Scrolling is working as intended, along with sprite drawing and hiding. Planning to implement half-decent collisiondetection as the next thing, and then move on to more gameplay, like picking up soldiers and bringing them to a drop-off point.

Download Here --> http://nintendo-ds.dcemu.co.uk/choplifterds.shtml