Falafel has released a game called Grid Soccer.

Here is Falafel’s description:

hello everyone!

Well this is my first homebrew game 🙂

It’s a 2 player game you can play during boring lectures ^_^
the objective is to get to the goal on either side of the field (the one with the moving cube in your colour is the one you have to hit)
and if you hit a point where you hit another line you “bounce” and you can put down an extra line.
if the screen goes red, red player wins.
green is the same but (guess what?) green player wins :p
and blue means your stuck and noone wins (or whatever you want to happen anyway)
press B to restart

Have fun!

Thanks to http://www.dev-fr.org for the screenshot.

http://forum.gbadev.org/viewtopic.php?t=14795