Really great game, one of my favorites so far. I had a similar idea to do a box scan, but ended up going in a different direction. I assume you used this technique for the xray machine? I love the art style, good music and sound as well. Nice job!
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Thank you for the feedback and sharing that tutorial.
I used a different approach, but I am surprised that I did not come across this tutorial while trying to implement the effect. My solution used this mask shader to implement the technique - funnily enough, the topic for that thread was discussing how difficult it is to mask sprites in Godot. I came close to giving up before finding that.
If you are interested, you can see my shader here and the script which supplies the shader arguments here :)