The Humans is rated for gamers 3 years old and up, but the tougher puzzles and challenges are too hard to kids this young to complete. Many younger gamers will just be confused and confounded by the puzzles and challenges, and want to play a different video game.
The Humans includes dinosaurs in the game play, but dinosaurs are at least 65 million years removed from the time humans were first seen on the Earth. This addition might make younger gamers think that dinosaurs and humans actually lived at the same time in history and this is probably not a good thing to be teaching them, but in terms of gameplay, it adds a certain element of adventure to the gamer.
You'll need to repeat the platforming movements for all of The Humans to get them to the spot you need them to be. It can be frustrating and boring to have to repeat the same motions over and over, and if you get bored and make a mistake, you'll have to start from the beginning.