Might not have story:

$0 https://store.steampowered.com/app/1580970/Samorost_1/ +sequels

$7 https://store.steampowered.com/app/730820/The_Curse_of_Monke... +sequels

$8 https://store.steampowered.com/app/323320/Grow_Home/ +sequel

$10 https://store.steampowered.com/app/207690/Botanicula/

$10 https://store.steampowered.com/app/303210/The_Beginners_Guid...

$10 https://store.steampowered.com/app/224760/FEZ/

$10 https://store.steampowered.com/app/711660/CHUCHEL/

$15 https://store.steampowered.com/app/413150/Stardew_Valley/

$15 https://store.steampowered.com/app/225080/Brothers__A_Tale_o...

$15 https://store.steampowered.com/app/716500/Eliza/

$15 https://store.steampowered.com/app/22000/World_of_Goo/

$15 https://store.steampowered.com/app/40700/Machinarium/

$15 https://store.steampowered.com/app/26800/Braid/

$15 (60% off = $6) https://store.steampowered.com/app/232430/Gone_Home/

$17 https://store.steampowered.com/app/448510/Overcooked/ +sequel

$20 https://store.steampowered.com/app/383870/Firewatch/

$20 https://store.steampowered.com/app/421120/Samorost_3/ (is a sequel)

$20 (60% off = $8) https://store.steampowered.com/app/343860/Tacoma/

$20 https://store.steampowered.com/app/501300/What_Remains_of_Ed...

$20 https://store.steampowered.com/app/1049410/Superliminal/

$20 https://store.steampowered.com/app/837470/Untitled_Goose_Gam...

$25 https://store.steampowered.com/app/753640/Outer_Wilds/

$25 https://store.steampowered.com/app/512790/Quern__Undying_Tho...

$25 https://store.steampowered.com/app/774201/Heavens_Vault/

$30 https://store.steampowered.com/app/1255560/Myst/

$30 https://store.steampowered.com/app/848350/Katamari_Damacy_RE...

$30 https://store.steampowered.com/app/255710/Cities_Skylines/ or $1 'til 20220614: https://www.humblebundle.com/games/cities-skylines-colossal-...

$30 https://store.steampowered.com/app/361420/ASTRONEER/

$30 https://store.steampowered.com/app/264710/Subnautica/

$40 https://store.steampowered.com/app/210970/The_Witness/

$40 https://store.steampowered.com/app/1158850/The_Great_Ace_Att...

$40 https://store.steampowered.com/app/220200/Kerbal_Space_Progr...

Violent / Not for little kids:

$0 https://store.steampowered.com/app/319630/Life_is_Strange__E... +sequels

$10 https://store.steampowered.com/app/400/Portal/ +sequel

$14 https://store.steampowered.com/app/246070/Hack_n_Slash/

$15 https://store.steampowered.com/app/252110/Lovers_in_a_Danger...

$15 https://store.steampowered.com/app/251430/The_Inner_World/

$15 https://store.steampowered.com/app/221260/Little_Inferno/

$15 https://store.steampowered.com/app/228360/Full_Throttle_Rema...

$15 https://store.steampowered.com/app/316790/Grim_Fandango_Rema...

$20 https://store.steampowered.com/app/653530/Return_of_the_Obra...

$20 https://store.steampowered.com/app/6300/Dreamfall_The_Longes... +sequels

$20 (80% off = $4) https://store.steampowered.com/app/959000/Edna__Harvey_The_B... +sequels

$20 (50% off = $10) https://store.steampowered.com/app/417880/Everybodys_Gone_to...

$30 https://store.steampowered.com/app/427520/Factorio/

$30 https://store.steampowered.com/app/282140/SOMA/

$40 https://store.steampowered.com/app/1850570/DEATH_STRANDING_D...

$40 https://store.steampowered.com/app/632470/Disco_Elysium__The...

$40 (50% off = $20) https://store.steampowered.com/app/1426210/It_Takes_Two/

$40 https://store.steampowered.com/app/257510/The_Talos_Principl...

$60 https://store.steampowered.com/app/582160/Assassins_Creed_Or... (explore)

$60 https://store.steampowered.com/app/812140/Assassins_Creed_Od... (explore)

$70 (94% off = $4) https://store.steampowered.com/bundle/18569/Deponia_Full_Scr... (4 games)