If you loved Gurren Lagann The Movie: Childhood's End, try Promare
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.
What they share
Both films are directed by Hiroyuki Imaishi, and they both carry the playful mood tag, and they sit in Action / Animation territory. If that's the register that drew you to Gurren Lagann The Movie: Childhood's End, the second film will land in a comparable space — through a different lens.
playful
What Promare is
You're a firefighter battling mutants suddenly gifted with flame-control. But their inferno hides a secret about the planet's fate. Imaishi's hyperkinetic style finds a new gear. The film leaves you blasted by color.

