I like the graphics and the atmosphere. It took me a while to understand how to move.
After finishing the 3nd level I found myself hoping for a goal (or some change to happen), something to keep me going.
May I suggest to keep the music playing even after falling, so that it doesn't restart each time? I think it really contributes to the atmosphere.
Also at the end of the level, is that intentional that I have to stand still to win? I got to the end and just kept going (and obviously fell through the thin ice).
Thanks for making it!
L10r