Valheim, with couple of friends it is one of the best games in decade. Done by swedish team iron gate and published by coffee stain which is also swedish.

Isn't the Horizon franchise made by a Dutch studio?

Town to City is a very cute and cozy city builder with a very calm pace, from a small studio in the Netherlands.

What about Tri: Of Friendship and Madness

It's a puzzle FPS kinda reminding me of Portal.

Stray, A Plague Tale, Noita

Intravenous

Kingdom Come Deliverance 1 and 2 by Warhorse Studios - Czech

No Man’s Sky by Hello Games - UK

Planet Coaster 1 and 2 and Planet Zoo by Frontier Development - UK

Tactical Breach Wizards has been a lot of fun lately

Arc Raiders: it was produce by Embark Studios located at Stockholm

Factorio is nice

Noita absolutely rules, and is Finnish.

No one has mentioned S.T.A.L.K.E.R. yet?

Not indie but still good:

• Remedy - Control, Alan Wake.
• Embark - Finals, Ark Raiders.
• Flying Wild hog - Trek to Yomi

I'm biased because I go to the same school these guys went to but check out Wrong Organ: https://www.wrongorgan.com/

They made Mouthwashing and How Fish is Made, both are weird as fuck

Lead dev of Ultrakill is Finnish and he said it's okay to pirate the game if you can't afford it

There are so many! What kind of games do you like? For example Spilled! Was made by a Dutch solo dev while living on her houseboat.

I suppose that they would still count even though their first game has been running for over a decade.

I love Keen Software House, and their games Space Engineers and the new Space Engineers 2 that is in early access.

(They are based in the Czech Republic)

How about the fartastical Diarrhea 4? Not only by a European indie dev, but also inspired by a Lemmy comment!

Warehouse studios (KCD2) in a bit big for real indie but it's not AAA either. They are pretty European afaik.

EGOSOFT (the X series of space empire simulators) is based in Germany.

I'm not sure if it counts as indie, but I played Eriksholm in December and enjoyed it quite a bit. I'm also playing TR-49 at the moment that's scratching my Roottree itch.