Recently my Dad bought me a R4 Card for my DS For homebrews, and i'm going to try making my own.
The idea? Blockland on DS, With the top screen as the brick selector and the bottom for the first-person view.
The idea that you use the buttons on the right to select bricks, And the left for moving around, Move the 1st person camera with the stylus, And tap to fire a brick.
I hope i can actually make it, If not, Blockland 2D I guess.
Edit: I hope this is the right place, Since it involves a DS