In Snowman Reloaded by Ziz you are a snowman with the task to kill a given number of enemies per level to unlock the next level. If you collect snow you grow, but nearly every action you do let’s you loose snow again like jumping (1 snow), shooting (2 snow) or getting hit by an enemy (3 snow). So you have to economize your snow.

http://repo.openpandora.org/?page=detail&app=snowman-reloaded