These deer need your help to cross a ravine. You form a kind of bridge of tree-trunks, on which the deer can land and jump. Collect the flowers that come down: these are worth bonuses. The orange balls on the top right-hand corner of the screen indicate how many lives are left, and the orange-pink bar indicates how long the red trunk will be frozen.
Use the mouse to move. Hold the left mouse button to freeze the red tree-trunk.