Game files

Shaders/static_blocky.gdshader

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+shader_type canvas_item;
+
+// Parameters
+uniform float alpha_threshold : hint_range(0.0, 1.0) = 0.1; // below this = fully transparent
+uniform float alpha_modifier : hint_range(0.0, 1.0) = 1.0;  // global alpha multiplier
+
+void fragment() {
+    // Sample the current frame automatically
+    vec4 tex_color = texture(TEXTURE, UV);
+
+    // Convert color to luminance (grayscale)
+    float lum = dot(tex_color.rgb, vec3(0.299, 0.587, 0.114));
+
+    // Apply threshold: if below threshold, alpha = 0
+    float alpha = lum < alpha_threshold ? 0.0 : lum;
+
+    // Apply global modifier
+    alpha *= alpha_modifier;
+
+    COLOR = vec4(tex_color.rgb, alpha);
+}