I wanna learn japanese, what are some interesting novels or games that have written japanese but are for kids in elementary school or can just read kanas.

I can read kanas and some basic kanjis, but I just try to look up some light novels or games and they require a teen level of reading, too advanced for me.

My grammar and vocabulary is like a small kid (5-6 year old), so games from internet or anime or light novels are too advanced for me.

I would love any help.