From GameBrew - a wiki dedicated to Video Game Homebrew.
Spout is a DS homebrew shooting game where you have to shoot squares.
you control a suqare which is capable of spouting sand-like cubes. Your ability can used to propel and not fall off the screen, you can also shoot the gray walls and destroy them gradually.
The goal is to keep going up without hitting the gray wall, or the side, or bottom edges of the screen.
Left/Right - Change shooting angle
A/B - (hold) Shoot
Start - Pause game
Select - Swap displays (between upper and lower)
iTouch DS (firmware 3.2b)
R4DS (firmware 1.18)
M3DS Real (firmware 4.3g)