I do quite like the simplicity of the graphics and color scheme, and the mouse and how it's animated is cute. There seems to be a bug, though, and I couldn't get past this point early on: 
I don't know if it's actually a bug, but I couldn't get up through the other side either with faces on the boxes. I was also a little confused if I was missing controls or something, because I found the button that throws snowballs but it didn't seem to do anything other than make a sound.
Is there a trick I just didn't see? I hope that's the case because I would really like to be able to try it further to give better feedback.