Does anyone know of a PC game that you can play chilled without trying hardhards or a great skill other than Minecraft?
Gta V
A Hat In Time is a very fun game in my opinion and very relaxing
No Mans Sky, Defeat, Transport Fever 2
I currently play when it should be stress-free. But I don't know if they are your genre.
Trine 1 and 2
I like some classics in this regard, but sometimes in special versions:
Free:
Ballerburg (https://www.chip.de/downloads/Ballerburg_13009389.html)
Arkanoid 4000 (https://www.myplaycity.com/de/arkanoid_4000/)
BlockOut II (3D-Tetris) (http://www.blockout.net/blockout2/)
OOlite (modern "elite" clone and more) (http://www.oolite.org/)
Commercially:
Into the Breach (https://www.gog.com/game/into_the_breach)
Settlers II (https://www.gog.com/game/the_settlers_2_gold_edition)
FlatOut II (https://www.gog.com/game/flatout_2)
Stronghold HD (https://www.gog.com/game/stronghold)
Torchlight 1 (https://www.gog.com/game/torchlight)
Torchlight 2 (https://www.gog.com/game/torchlight_ii)
Trine (1) - Enchanted Edition (https://www.gog.com/game/trine_enchanted_edition)
Evoland (1) (https://www.gog.com/game/evoland)
Evoland (2) (https://www.gog.com/game/evoland_2)
Worms 2 (https://www.gog.com/game/worms_2)
Worms W.D.M. (https://www.gog.com/game/worms_wmd)
Rayman Forever (https://www.gog.com/game/rayman_forever)
Rayman Origins (https://www.gog.com/game/rayman_origins)
Asterix & Obelix XXL 2 (https://www.gog.com/game/asterix_obelix_xxl_2)
S.W.I.N.E. HD remaster (https://www.gog.com/game/swine_hd_remaster)
Firewatch (https://www.gog.com/game/firewatch)
AER (https://www.gog.com/game/aer)
Ghost of a tale (https://www.gog.com/game/ghost_of_a_tale)
Depending on how much bite you take, these titles can be played quite relaxed. Of course, that also depends on personal preferences.
If you are more interested in a specific genre, I could maybe make some more specific suggestions.