If you loved Armitage III: Poly Matrix, try Mobile Suit SD Gundam Mk III
A bridge between a film you've already seen and one most people haven't. Mobile Suit SD Gundam Mk III has roughly 5.3× fewer votes than Armitage III: Poly Matrix — it's a deeper cut, not a mainstream recommendation. Here's what they share, and what the second one does that the first one doesn't.
What they share
Theyboth carry the 3am cult mood tag, and they sit in Animation / Science Fiction territory. If that's the register that drew you to Armitage III: Poly Matrix, the second film will land in a comparable space — through a different lens.
What Mobile Suit SD Gundam Mk III is
A collection of super-deformed Gundam shorts is certainly a thing that exists. The world of Gundam is re-imagined with short, comedic stories. It's probably best enjoyed by people already invested in the franchise.

