When I watched Made In Abyss in 2017, I found that this anime had a lot of similarities to The Promised Neverland.
First, the characters. Both anime focused on a group of kids who lived in an orphanage. Living in a limited area (as the adults prohibited them to go to certain places) made them wonder, how does it feel to be outside.
Next, the design. Both anime have cute character designs that if you recommend it to someone who just watched anime (or someone who only watches specific genres), they would probably answer "Sorry, I'm not into childish anime". Nonetheless, both anime have astonishing art.
And the last is the story. Even though the character design is cute, but the story isn't cute at all. The atmosphere turned dark pretty quick. The outside world is not as nice as they think it could be. They have to fight and run from terrifying creatures in order to survive.