The reply above should help I'll type it again for ya :-)
This happens quite a bit when you go too far from the numbers, often if you click once itll fix!
Hey! I don't often add non steam games so im not an expert. However, just first try and follow the advice by the dev which i'm sure you already have but just in case. If that doesn't work try removing it then doing the same that helped me! Hope i could help! :D
If you can't find the advice then here it is.
If you want to delete the saved data, or you accidently change the resolution of the game and can not change it again then go to:
C:\Users\YOURNAME\AppData\Roaming\Godot\app_userdata\That's not my neighbor
I only know it from the impossible quiz haha. I found this online "According to Douglas Adams, creator of The Hitchhiker's Guide to the Galaxy, The number 42 is the "Answer to the Ultimate Question of Life, the Universe, and Everything", calculated by an enormous supercomputer named Deep Thought over a period of 7.5 million years." and it's quite interesting!
Hey! You can sometimes still play without a supported GPU its a bit more complicated but in my opinion worth it. This is from the fixes and stuff above.
Sometimes you can run the game on windows even if your gpu doesn't support vulkan you can do it by following this steps:
1. Open the Command window
( 'Window'+R then type cmd or cmd.exe)
2. Grab the downloaded that's Not my neighbor strait from downloads and drag it into the command Prompt.
(If you Did it right it should say something along the lines of -(C:\Users\Name>"C:\Users\Name\Folder\That's not my neighbor.exe"-)
3. After the .exe" type ( --rendering-driver opengl3)
(The space is required, the brackets are not and may break the command)
So after that you should Have = (C:\Users\Name>"C:\Users\Name\Folder\That's not my neighbor.exe" --rendering-driver opengl3 =)
4. Hit enter
Then the game should run.