It good enough to deserve a remake.
Nice script, I'm no fan of mecha, but that doesn't affect my review.
I think the major problem is the drawings. While being better than most of what you'll find around, it does take away from the story itself, which has a potential to go professional bigger than a number of famous animations. Sometimes their lines seem more dramatic than the situation being represented on screen, and the special effects deserve more attention. Also, focus on the facial expressions, as you're strongly inclined to drama in this piece. Study the camera positions as well.
Sometimes I feel like a voice actor didn't get the spirit of a particular line, and that affects my overall satisfaction with the movie. Still. the voices are quite good as a whole.
Another big problem are the audio. In a piece like this one, I would prefer to have an ambient audio all along, following the mood of the current scene. Silence should be used moderately. Also, the sound effects appear quite weak in the awkward silence.
I understand your limitations of filesize, but I'd rather have even shorter parts so that you can make something even better.
Keep drawing!