Not playable. When I press start there is a message which says the game exe is missing. Validating and reinstalling doesn't help. What to do?

My small brain made this game harder than it actually is, but after pulling all 6 of my brain cells together, I could appreciate the simplicity of the concept and the elegance of the mechanical execution. This game is neat. Here's how it went for me: https://youtu.be/8v8wGvIzRs4...

On Monday evening, 3 30-year-old men spent 4 hours trying to solve this puzzle in order to find out the code for the door. How? How? How? Now I'm going to have nightmares about this note board. https://gtm.you1.cn/id/hardvoltage/screenshot/2521536445240014149/...