If you loved Pretty Cure All Stars: Spring Carnival, try Futari wa Precure Splash☆Star the Movie: Tic-Tac Crisis Hanging by a Thin Thread!
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.

Pretty Cure All Stars: Spring Carnival

Futari wa Precure Splash☆Star the Movie: Tic-Tac Crisis Hanging by a Thin Thread!
What they share
Both films are directed by Junji Shimizu, and they both carry the atmospheric, cozy, foreign gem, late night mood tags, and they sit in Action / Adventure / Animation / Comedy / Family / Fantasy territory. If that's the register that drew you to Pretty Cure All Stars: Spring Carnival, the second film will land in a comparable space — through a different lens.
What Futari wa Precure Splash☆Star the Movie: Tic-Tac Crisis Hanging by a Thin Thread! is
Time froze mid-karaoke for Saki and Mai, a party foul that somehow escalated into a rescue mission. Pitched into Land of Clocks, they meet Sirloin who’s pinching the Infinite Clock, a theft the Pretty Cure pair reluctantly counters. While bickering about tactics, they nearly drop the ball entirely.