It just made me sad, and not happy/sad like the little boy with the present or the bear in the cave.
The poor man has spent his ENTIRE life on his own presumably, or even maybe had a wife and now she's gone and he just sits there on the moon everyday. The little girl gives him a telescope(!) so he can just sit there and watch everyone else have fun and spend time with their loved ones. He can't join in, he can't communicate, all he can do is peer through that telescope. Then when he puts it away he's just as alone as he's ever been, and he's reminded that he'll spend the rest of his days that way.
She could've sent him a smartphone, so they could talk.
She could've sent him a pen and paper.
She could've sent him a bloody parachute or even a glider!
But no, she sent him a telescope so he can stare at her and cry. Merry Christmas