The best game I ever got my kids is Cuphead. I just randomly got it one day and it quickly became a favorite. My kids still play it years later. It's basically an arcade style run-and-gun game with boss fights, but it's in a class of its own I think. First it is very challenging, so he won't finish it all in a weekend. But the best part is the artwork and especially the music is truly excellent. All old timey 30's style cartoon artwork and big band swing. I bought the soundtrack on vinyl it's so good.