well, yeah, but no. I get your point. but, sadly, it won't make that recommendation earlier.
I have to learn how to formulate my thoughts clearer, I know.

I was going to suggest: https://www.gog.com/game/the_dungeon_of_naheulbeuk_the_amulet_of_chaos
as you can't get more generic than a satire on all the common tropes of the genre and then I realised OP was French and probably knows about it already.

So anyway I have been hearing a lot of positive things about Gloomhaven which is a tabletop fantasy game with a lot of content.

Ha ha yeah Naheulbeuk is awesome :)

I don't know about Gloomhaven, will have to check !

Just saw this post when it got bumped.

Not available on GOG, but there's Pool of Radiance: Ruins of Myth Drannor.

It's 20 years old this year, set in the Forgotten Realms (same as Baldur's Gate and Icewind Dale) and uses the D&D 3.0 ruleset. I've been running it under Windows 7; I'm not sure how well it'll work under Win10. If you have an older computer that still has XP, that'd be best.

It's a standard dungeon crawler with a decent backstory, timed turn-based combat (although you can turn the timer off) and a party size of up to 6 PCs. (You start with up to four, and can recruit others as you go.) It's famous for a glitch that would erase your entire hard drive if installed; so if you do get this, make sure you have the latest update (v1.4, IIRC).

You can find Let's Play clips of it on Youtube. And its predecessor, Pool of Radiance, should be available as freeware.

Death Gate
Shannara
Deathtrap Dungeon
Talisman: Origins

What predecessor? You don't mean this one, do you?

Yeah, that's it. Totally forgot I had it on here as well. It was abandonware before GOG polished it up to run on more modern systems.

Not the same as freeware though. And I believe PoR: Ruins of Myth Drannor is "abandonware" then, too, seeing that it's not sold in stores anymore and there never was an official digital version. Sorry, just nitpicking a little. ;)

That's a fair point.

And yes, I have it and I play it quite a bit. It's fairly linear with a few skippable areas; and IMO best played with a group of 1-2 PCs, rather than four or more. (You level up faster, and experience fewer frustrations of someone moving too slow, getting trapped behind a boulder, or being out of position when the battle starts.)

Some of the monsters, most notably the undead, take a long time to move, and/or shuffle randomly about when they can't reach you, which can get frustrating. (I believe there are mods to speed them up, but I haven't used them.) And modern video drivers can be hit-or-miss, failing to display important things (like phylacteries and treasure chests) which should be in plain sight.

But the 3.0 ruleset allows a lot of flexibility when it comes to multiclassing; done right, you can make your party OP at a fairly low level. Some people may not appreciate that; but for me, a big part of the fun comes from figuring out new ways to be bigger and badder than the final boss.

If you do decide to do a solo run, the traditional hardest start is with a halfling monk. But I've found a halfling ranger to be even tougher; their small size means no longbows, any decent armor weighs them down, and being mobbed by enemies means they never get to use their shortbow past the first round anyway, most of the time.

I think Enclave could fit. Plus that game has some of the coolest looking armors I've seen.