Ima, Soko ni Iru Boku, Made in Abyss Recommendations
Both featuring deceiving art styles and children in messed up situations.
These series are very similar in that it thrusts very innocent children into a dangerous world, and they have to figure out how to survive on their own with very little help. Both shows are grim and brutal, and ultimately a very worthwhile experience of drama and the realization that not everything is all fun and rosy.
Despite looking completely different, the two TV series feel very similar while watching.
They tell a story of a kid, that has just been exposed to the dangers of the world and is trying to deal with unpleasant situations (no spoilers) that come up against it. You will be hearing them saying "It's OK, everything will be good", but you know it won't be because this world is a cruel place.
Or you're going to learn with them.