Not quite sure how to start this post, but I guess maybe a little bit of my own background could be useful?

I'm 41, Father of two young kids (almost 8 and 5), been gaming my entire life. I have a PC games library that's well over 20+ years old and 1000 games deep (not to brag, just for context) that my kids mostly (curated for them) have access too. My first multiplayer game was at about 11-years old with the Quake demo in 1996, later got heavily in to MMO's (Everquest, DAOC, WoW, etc) and in the early 2010's, I was heavily in to World of Tanks/Warplanes.

My oldest really wants to play Fortnite (which means the youngest will also play) and I'm a little torn on if I should allow that or not. They've played it a decent amount at their Uncles house and I'm well familiar with the game, though I've never played it or a Battle Royale style game myself and I don't really find anything objectionable about the content of the game itself, but I'm pretty reticent to put it on my own computers and make accounts for them to be able to play at home.

I can't exactly put my finger on why that might be, but I'm currently attributing it to the FOMO mechanics with skins, as well as the generally addictive nature of online games themselves, given I've been addicted to them myself. My kids only have a limited amount of time to play games or watch TV on any given day anyway, so I'm not necessarily concerned that they'll play it all day, but I am worried about their mental health when it comes to it. They both already get frustrated with games (but in different ways) and I feel like that would be exacerbated when they have a bad match or when they're called away to do something (which is a primary reason I quit multiplayer games when I had children. It became too difficult to disengage from a "match" of something and I'd become very frustrated and angry.) Now, I'm not afraid to take away things if they become a problem (they have been banned from Youtube) and while there's some short term pain associated with that, they tend to get over it after awhile. Also, I do generally feel that it's more wholesome to engage with stuff like Subnautica, Minecraft and other games that they're currently playing.

Anyway, I'm curious what other people's thoughts are on this subject. My wife proposed letting the older one have an account when they turn 8 here very soon, but I've told her about my reticence about it all, which she is understanding of. But I wanted to see if I'm being too anxious or paranoid about it and if Fortnite is actually fine for an 8 and 5 year old. I'm not generally one to wholesale ban things in the house and I'm open to all types of games and experiences, just not sure if it's totally appropriate yet.

Side note: there is the side benefit that I might (probably not often) play with them, but that they also have the possibility of playing with their (much older) cousins and their Uncles. Though I'm not sure any of them are able to play during the times my kids have their screentime.

I'm looking for games that I can play and enjoy with my 8 years old son. It doesn't need to be a 2-players game, or even a game that he can play (though if he can take the controller and get actively involved, that's better), but just something that he can enjoy as a "backseat player". We have a Switch, a PC, and a PS4.

tl;dr: "backseatable" adventure-ish games with exploration and a clear direction (different sights to see, and a sense of progression), puzzles (so he feels involved when exchanging ideas), ok with light horror. Low stakes, low stress.

Here are some games that we played together and both liked:

• Outer Wilds: loved it so much we did 2 playthroughs in 2 years. He liked the sights, the exploration/treasure hunt aspect, the puzzles, and he asked me questions about our universe and solar system. He was mostly passive as a player both times we played, but we were sharing ideas and he was making suggestions on what to do/where to go next.
• Link's Awakening remake: we played this one when he was 6 years old, with me taking the lead for the bosses or more complicated puzzles. We finished it together.
• Stanley Parable: I intended to play it alone, but unexpectedly he really liked watching me play.
• Strange Horticulture, Grim Fandango, Day of the Tentacle: he liked solving the puzzles with me, and me explaining/narrating what was happening and why.
• Portal 1 & 2: he was able to play on his own with some help, and the coop levels in Portal 2 were great.
• Deep Rock Galactic: he's making his own story and narrating along while I (and sometimes random players) play normally.
• Human Fall Flat: he loves the slapstick humor and finds better (and more creative) solutions than I do
• Mario Odyssey: probably his GOAT game, the accessibility features helped him a lot to play and enjoy it alone.

He's also taking an interest in light horror (specifically mascot horror) games:

• Garten of Banban series: objectively bad games but he really enjoyed the progression, light puzzles, and the liminal level design.
• Indigo Park: much better production value, mostly a walking sim, but very short.
• The Complex: a free "Backrooms" game. He didn't play it since he wasn't yet comfortable with mouse and keyboard controls, but liked watching me explore around
• Crow Country (demo): he backseated and enjoyed it. There's an "exploration mode" that removes enemies. Will probably buy the full game later.

And some "failed" tentatives:

• Tunic: since he liked Link's Awakening, I thought he might like Tunic, but no. Probably because of a lack of NPCs or clear indications, and the game is too difficult for him. Not fun to backseat.
• Zelda BOTW: he tried to play it when he was a bit too young, and had a hard time with it. I'll probably try again soon.
• Minecraft Dungeons: we played 2-3 games but he got bored of it very quickly.
• Diablo 3: he saw me playing and wanted to try it. He liked it much more than Minecraft Dungeons but hated seeing villagers getting turned into zombies, so we stopped here.
• Sandboxes: not his thing (Minecraft, Terraria, No Man's Sky, Animal Crossing)

So in summary, I highlighted the best experiences we had (with Outer Wilds being the best), and I'm looking for something equivalent.

EDIT - I'll try to keep this post up-to-date with the suggestions we liked:

• Superliminal: Excellent, I wasn't expecting such a good game. He's managing most of it alone, and there's even a (harmless) "scary" section
• Untitled Goose Game: Great suggestion. We actually already played it (not to completion), and he loves honking and absolutely not helping me complete the objectives 😅
• Layton series: I think he tried the first one on my DS for an hour or two. I'll suggest it again and be the backseat player myself.
• Luigi's Mansion 3: GOTY
• Poppy Playtime: mascot horror games, but actually good. Each game is longer and (as of the 3rd one) better than the previous one. The 3rd game is a legit horror game, with a clear inspiration from Silent Hill PT (and others like Bioshock).
• Kirby Forgotten Land: did not enjoy by himself, kinda liked it in coop. I think the cute pink ball is no longer aligned with his current tastes.

Has anybody had much experience playing DnD or other tabletops with children? I've been toying with the idea of making a fairly straightforward and simplified RPG using Story Cubes and GURPS that kids can get involved with easily and have fun playing. I'm specifically aiming to play with my daughter (8) and my niece (5) on a big family holiday in August, though I see no real reason that this couldn't work with adults as well.
Essentially, the conceit would go along the lines of each player rolling a limited number of story dice to help with character creation and such. I'd ask the players a few simple questions about their powers (for example, are you more of a wizard or more of a warrior?) to get some basic stats stats together (STR, DEX, INT, CON), and then use story dice myself to quickly improvise a short one-shot session.

Does anyone have experience playing with kids, and if so - any pointers? Am I being too ambitious about children's ability to imagine stuff in this way? If so, are there any good systems out there that are good for young people to pick up and get stuck into roleplaying with?