This solved my problem. Thank you.I managed to resolve this issue, so I will post the solution here for anyone who might have the same problem in the future.
The name of the exe of my game was "Lake", so I had to delete the C:\Users\(name)\AppData\Local\Lake folder instead of UnderTheWitch folder, which I had tried previously. After I did this, the game ran smoothly.
I had downloaded it in a different site, so this solution might not matter to users here though.