final commit

assets/shaders/blur.gdshader

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+shader_type canvas_item;
+
+// Allows you to sample the pixels rendered behind this node
+uniform sampler2D screen_texture : hint_screen_texture, filter_linear_mipmap;
+
+uniform float lod : hint_range(0.0, 5.0) = 2.0;
+uniform vec4 color_tint : source_color = vec4(1.0, 1.0, 1.0, 0.1);
+
+void fragment() {
+    vec4 blurred_screen = textureLod(screen_texture, SCREEN_UV, lod);
+    COLOR = mix(blurred_screen, vec4(color_tint.rgb, 1.0), color_tint.a);
+}