EgoTrip updated his Nintendo DS homebrew game Ice Slider. Ice Slider is a puzzle game, with the objective of collecting 10 coins on each level. However, there is a catch, once you start moving, you cannot stop until you hit an obstacle. Obstacles include brick walls which cannot be passed, ice walls that break when bumped into, and directional walls which you can only move through in the indicated direction. There are 80 levels in total, which should keep you busy for a while.

http://forum.gbadev.org/viewtopic.php?t=17865