I enjoyed this feel-good VN! It's a nice surprise to read about Christmas celebration in an unconventional setting (normally the winter stories are about being in a warm home, snow outside, you name it). The usage of technical term is cool too for the sci-fi fans among us.
It's also very clever to pick a space shuttle as the location, since you utilise the VN style sprites in such a refreshing way where their movement (spinning around or moving in/out the screen) looks realistic to the zero-gravity environment.