Portals - Godot Shaders

I want these portals to move in my game. i want them to have a vortex kind of move to them as well as particles
Shader code

shader_type canvas_item;

uniform vec4 portal_color : source_color = vec4(0.9, 0.05, 0.08, 1.0);

uniform float rotation_speed = 0.8;
uniform float vortex_strength = 3.0;
uniform float swirl_detail = 5.0;
uniform float glow_strength = 1.5;

void fragment() {
    // Center UV around 0,0
    vec2 uv = UV - vec2(0.5);
    
    float radius = length(uv);
    float angle = atan(uv.y, uv.x);

    // Don't draw outside the circular portal
    if (radius > 0.48) {
        discard;
    }

    // Time-based rotation
    float time = TIME * rotation_speed;

    // Stronger twisting toward the center
    float twist = (1.0 - radius) * vortex_strength;

    angle += time + twist;

    // Convert back into coordinates
    vec2 vortex_uv = vec2(
        cos(angle),
        sin(angle)
    ) * radius;

    // Create spiral waves
    float spiral =
        sin(
            angle * swirl_detail
            - radius * 20.0
            - TIME * 4.0
        );

    spiral = spiral * 0.5 + 0.5;

    // Inner energy
    float inner_energy =
        smoothstep(0.48, 0.05, radius);

    // Outer ring
    float ring =
        smoothstep(0.46, 0.40, radius);

    // Combine
    float energy =
        spiral * 0.55 +
        inner_energy * 0.45 +
        ring * 0.5;

    // Strong glowing center
    float center =
        smoothstep(0.18, 0.0, radius);

    energy += center * 0.8;

    // Final color
    vec3 color = portal_color.rgb * energy;

    // Soft glow
    color += portal_color.rgb *
             pow(1.0 - radius / 0.48, 3.0)
             * glow_strength;

    COLOR = vec4(color, energy);
}
Shader code

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