This is also happening to me. It happens due to modified steam dll files, it is a simple anti-piracy tactic that the developer, SuperKu, used in Pogostuck.
Game hasn't been cracked yet. You can go to online-fix.me and download the game there but sadly the game can't save but you can still test the game out and see if you want to buy it or not
why did you delete it? just get goldberg emulator and replace necessary files like steam_api.dll and steam_api64.dll and go into the ini fle you deleted and replace name igggames with something else . (edit i see why you deleted it now but don't do that)
I am unsure of how to fix this at the moment.
Don't bother telling me to delete valve.ini (the fix for a previous version), that file literally doesn't exist in the latest version you uploaded.
Edit: For anyone having this problem, removing the valve.ini configuration file from the game folder fixes it.
just get goldberg emulator and replace necessary files like steam_api.dll and steam_api64.dll and go into the ini fle you deleted and replace name igggames with something else .
(edit i see why you deleted it now but don't do that)
dont deny it the first time when you saw the title this came to your mind xD
I tried the Pogostuck 1.8k file but won't open :(
Please help
And it says: "PLEASE LAUNCH THE GAME FROM YOUR STEAM LIBARY"