If you loved Broken Blade: The Path of Separation, try Mobile Suit SD Gundam's Counterattack
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

Broken Blade: The Path of Separation
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Mobile Suit SD Gundam's Counterattack
What they share
Both films are directed by Tetsuro Amino, and they sit in Action / Animation / Fantasy territory. If that's the register that drew you to Broken Blade: The Path of Separation, the second film will land in a comparable space — through a different lens.
What Mobile Suit SD Gundam's Counterattack is
Here we have a film that is mostly for children. The SD Gundam universe is represented in two short parodies of war and high school. It's doubtful this will be anyone's favorite Gundam entry, but it exists.