The game, which you lack in Steam

A lot of them. Something else can be found, however, the prices are not fun. And these are gray markets.
As for the list, here it is: Alice Madness Returns and its first part, The Chronicles of Riddick, GTA 1-2, Anabiosis, Silent Hills, old NFS, new parts of witchcraft and assassins, the first parts of the scrolls with adaptations for wasps and iron.

Feimtan
Dreaming is not harmful. Also say CS GO at EGS.

GEX

Bloodbourne essno, too lazy to cut the game station every time)

Red alert 2 yuri revange

SILENT HILL 1.2.3.4 and further on skisk.

bloodrayne, will rock and other old games and DC2

Corp238
Wake up, both parts were recently released in an improved version: https://store.steampowered.com/app/1373510/BloodRayne_Terminal_Cut/

jigadloff ATP
, I forgot that they are in my library, And DK 2 will be, zakos under will rock?

Anabiosis: Sleep of Reason, Blur

Flashet
Probably missed the moment of going to steam)
https://store.steampowered.com/app/1238080/Burnout_Paradise_Remastered/

Armies of exigo

Rocket League - it's a shame that it was moved to EGS