Hey, I'm back! Thanks for reporting the problem with me. I've just uploaded a fixed version of the game that you can download and use instead of the previous one.
This one should have all Steam dependancies removed so no more API calls will try to validate a key that doesn't exist.
See the changelog: https://shidygames.itch.io/escape-space/devlog/886859/hotfix-1
Again, sorry for that! Hope you'll have fun with the game and thank you for supporting the GG25 strike fund!