Just use the wiimote D-pad to move around the screen and avoid coming in contact with the red blocks for as long as you can to set a new high score.
Release notes:
Here is an update to Avoidance.
I added support for nunchuck and classic controllers, added music (GET OUT OF MY ROOM!! by VideoJames), modified your motion blur/trail to not show your black outline and improved the games performance. I decreased the movement speeds per frame but with the higher frame rate I think it still works out to being a slightly faster game then it was previously. Its still manageable though especially if you play using an analog stick and the real difficulty still comes more from the crazy number of things on screen to avoid and less from how quickly they move at you. Your score increases faster now also.
v1.1 – August 25, 2010 – http://www.multiupload.com/27KTYRY42Y
* Added optional support for nunchuck and classic controllers.
* Added music (GET OUT OF MY ROOM!! by VideoJames).
* Modified your motion blur/trail to not show the black outline.
* Improved frame rate.
Thanks to http://www.nintendomax.com/viewtopic.php?t=12327&f=54 for the news.