Need advise about new Christmas game on Android. You can help to make it better.

Hey, we're PlanemoSTD, mobile game development studio from cold Russia. Christmas is near and inspired we developed a "Snowball" game using unity3d ... but it is a bit far from ideal )

What about graphics, sound, gameplay ? We would appreciate very much any reviews about our project, wishes, criticism.

Link to screenshot from game: http://i.imgur.com/3wokq.jpg

Apk file with the game itself: http://www.mediafire.com/?zg32022gbx42q9e