If you loved Gurren Lagann the Movie: The Lights in the Sky Are Stars, try Gridman Universe
A bridge between a film you've already seen and one most people haven't. Gridman Universe has roughly 5.0× fewer votes than Gurren Lagann the Movie: The Lights in the Sky Are Stars — 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.

Gurren Lagann the Movie: The Lights in the Sky Are Stars

Gridman Universe
What they share
Theyboth carry the foreign gem, playful mood tags, and they sit in Action / Animation / Science Fiction territory. If that's the register that drew you to Gurren Lagann the Movie: The Lights in the Sky Are Stars, the second film will land in a comparable space — through a different lens.
What Gridman Universe is
You attend Tsutsujidai High School, deciding to confess to Rikka, but Gridman returns with a warning, and then the world's balance begins to collapse. Director Akira Amemiya brings this chaotic universe to life.