Almost like a preamble for Neon Genesis Evangelion but without its too philosophical ending and with a bit of silliness. The science fiction in this is extensively researched and mostly works with the existing theories of that time even though certain liberties are taken in including some rejected theories. But it never tries to give much exposition on anything. This highly intelligent side is covered with some sappy and silly stuff too which kind of doesn't make too much sense to me. The time warping is used as the main source for emotional narrative here way before Interstellar. The details of animation and the emotion created by it is the best things about this even with all these other factors.
Review of Gunbuster
