The theme we were given was "It's dangerous to go alone. Take this!"
I did all the graphics in Photoshop, used FlashDevelop running in Parallels for my IDE, and used the amazing AS3 based Flixel game engine. I recorded most of the sounds for the game on my iPhone, and generated a few with cfxr.
My game can be played online here: qrun.ch/ld48
Henry Homesweet - Okii Robo Navigation System (8bc.org/members/henryhomesweet/)
FantomenK - CPU Mood (8bc.org/members/FantomenK/)
KOSMOPOP2 - C0C0C0 (Silver) (8bc.org/members/Kosmopop2/)
KOSMOPOP2 - 0000FF (Blue)