Add ice effect component to enemies and adjust collapsing bridge collapse time

shaders/shine_shader.gdshader

@@ -0,0 +1,21 @@
+shader_type canvas_item;
+
+uniform vec4 shine_color : source_color = vec4(1.0);
+uniform float shine_speed : hint_range(-10.0, 10.0, 0.1) = 1.0;
+uniform float shine_size : hint_range(0.001, 1.0, 0.01) = 0.01;
+uniform float shine_frequency: hint_range(1.0, 45.0, 0.5) = 5.0;
+uniform float shine_angle_deg : hint_range(-360.0, 360.0, 1.0) = 45.0;
+
+void fragment() {
+	COLOR = texture(TEXTURE, UV);
+	// Convert degrees to radians
+	float angle_rad = radians(shine_angle_deg);
+	
+	// Calculate direction vector for the shine line
+	vec2 shine_dir = vec2(cos(angle_rad), sin(angle_rad));
+
+	// Project UV onto shine direction
+	float projection = dot(UV, shine_dir);
+	float shine = step(1.0 - shine_size * 0.5, 0.5 + 0.5 * sin(projection + TIME * shine_speed * shine_frequency));
+	COLOR.rgb = mix(COLOR.rgb, shine_color.rgb, shine * shine_color.a);
+}