In Avalanche you play a white rectangle scrambling to reach higher ground as a red liquid rises from below. If the liquid reaches you then you lose. To get higher you have to jump on two different size square blocks that are constantly falling from the sky. Do not let them land on you because they will crush you.
Use the arrow keys to move around. Pressing in the direction of a block while you are touching the side of it will result in a slow sliding decent instead of a quick fall. You can jump from the slide. You can not double jump in the air. In some situations you may have to climb up a side by slide jumping a few times before landing at the top. There is no side to the board, jumping through either side will result in you instantly coming out the other at the same height.
Play Avalanche at http://www.deadwhale.com/play.php?game=93.