In Godot: Project (at the top) -> Project Settings -> Display -> Window -> Stretch -> *Mode* / *Aspect*
I think your "mode" might be "disabled" and that's the problem.
You can test it on your setup by zooming the web page in/out.
I forgot to mention that the wordle style feedback was really good.
I can't really tell you how to make it less bruteforcey. That was just my experience in not getting the hints.
Personally I prefer when the puzzle is objectively possible to be solved without trying out anything before hand.
Look at what other people felt like these kinda word puzzles can be very subjective!