For the most part, the manga is pretty cliché in almost all characteristics of an Isekai, but the biggest issue I can't ignore is the protagonist way of thinking is often illogical for someone who is an adult. Story: 6/10 Just your typical isekai manga plot where the protagonist goes to another universe, trains, and explores the world. But with animals. Art: 7/10 I find the art being average, but they made the animals cute/cool so it gets a + for that. Character: 3/10 So Arito is the main reason why I'm dropping this manga. For an adult who seems to be in his 30's going into the isekaiuniverse, I would expect him to think like an adult. Often enough though, he often makes childlike decisions where I forget that he used to be an adult in his past life. A big issue that happen (SPOILER ALERT of chapter 17), a group of child kidnappers attempts to kidnap Arito and after Arito captures them instead, he lets them go, because "these people don't seem to be hostile anymore." Its decisions like these that turn me away from Arito knowing this is an adult making these decisions.
Side characters are often obvious with their intentions so nothing interesting comes out of them.

Overall: 5/10
This manga could have just been your average isekai manga with cute animals, but with Arito being an adult in a child's body