If you loved Mobile Suit Gundam: The Origin I - Blue-Eyed Casval, try Mobile Suit Gundam: Cucuruz Doan's Island
A bridge between a film you've already seen and one most people haven't. Here's what they share, and what the second one does that the first one doesn't.
You already loved

Mobile Suit Gundam: The Origin I - Blue-Eyed Casval
→
Try this next

Mobile Suit Gundam: Cucuruz Doan's Island
What they share
Both films are directed by Yoshikazu Yasuhiko, and they both carry the outsider mood tag, and they sit in Action / Animation / Science Fiction territory. If that's the register that drew you to Mobile Suit Gundam: The Origin I - Blue-Eyed Casval, the second film will land in a comparable space — through a different lens.
outsider
What Mobile Suit Gundam: Cucuruz Doan's Island is
You pilot a mobile suit in a covert mission gone wrong, and then enemy forces attack, but the director Yoshikazu Yasuhiko leaves you with a desperate escape.