As I wrote somewhere before, I guess the crashes are caused by the high number of label3d elements to create the depth effect.
It seems to be a known issue too, I found a similar bug report: https://github.com/godotengine/godot/issues/66566
If you haven't done it already, download the fallback version, where I reduced the number of label elements used for the effect.
And if you want, try to play the tutorial level in both versions as many times you want as a benchmark, or compare it to other levels (the turorial level has by far the largest amount of 3D labels)