Challenging game. It took me several tries to figure out how to beat the game since you can only reheat the fireplace three times. For those of you who are having trouble beating it, use the fireplace when you have around this many presents:
-50 presents left (1st time)
-25 presents left (2nd time)
-10 presents left (3rd time)
The snow level will rise faster the closer you are to your goal, so try not to make any mistakes when you have less than 25 presents left to make.