Some Tips after more play testing and clocking it several times since its been uploaded. *EDITED* The sleigh is a bit hard/slow to steer due to programming compromise to ensure the integrity of the sleigh and reindeers not coming apart. They still can glitch and get tangled from time to time but not as often if not programmed that way. Besides the turning left and right will allow you to turn around to do an extra pass ensure you although a bit of distance before you turn around to allow to another proper pass at your target. So make your you stay out of danger by watching your height level as you can still accurately throw presents or drop coal from higher up. This especially helps on levels with high slopes or houses on higher hills etc. Also be sure to look out for the Stars on levels that say bonus these are required to complete some levels and you can get the stars by dropping coal on them.
So hopefully (if you don't rage out before seeing these suggestions) with a little practice you can complete the game and get the ending and a high score!
Thanks for playing