"Planet Zoo" is something we all enjoy. The building aspect of the game appeases everyone and we all love animals.
"My Time at Portia" is also an extremely excellent game (and there's a sequel coming out this year, "My Time at Sandrock"). We're terrible gamers, but we could beat this game, though there's no rush to do so. It's got outstanding visual design that our littles really love, there's animals you can get as pets, you make friends, you can date/marry, you resource collect, build, decorate you house, there's clothing options, and there's the entire story which is equally delightful. It has a young feel to it, but all of us enjoy the game, even the adults in our system who struggle with allowing the littles to do kid things.
"Donut County" is a cute and short game.
"Astroneer" isn't too challenging and ofters several planets to explore with really beautiful cores of them.
"Katamari Damacy REROLL" is just ridiculous and fun (though you will 100% want a controller to play it).
"Spirit of the North" is a simple game to beat, but really fun because you play a fox and you get magical powers. There's some puzzles to solve, but the older ones can help out with that if the littles struggle, but it should be fine. Even if you don't beat it, we enjoyed just playing as a fox and it's a beautiful game.
"Island Farmer" is a very cheap game and it's getting new levels. Very simple, puzzle-type of game anyone could beat, but very relaxing and enjoyable.
"Townscaper" is also cheap (and on sale right now for under $5 CND) and very, very simple, but relaxing. We got a little bored with it, but that's because we like more complicated building games, but as a game for children it could work very well.
That's what we've got in our library to recommend anyway.