particles/ParticleSimulation/Particle.cs

using Godot;

namespace Particles.ParticleSimulation
{
    public class Particle
    {
        private float _health = 1f;

        public Vector2 Position = new Vector2();
        public bool ScreenWrappedLast = true;
        public Vector2 Velocity = new Vector2();

        public Particle(int id, ParticleType type)
        {
            Id = id;
            Type = type;
        }

        public ParticleType Type { get; }
        public float AverageSpeed { get; private set; } = 1f;

        // ReSharper disable once UnusedAutoPropertyAccessor.Global
        // ReSharper disable once MemberCanBePrivate.Global
        public int Id { get; }

        public float Health
        {
            get => _health;
            set => _health = Mathf.Clamp(value, 0f, 1f);
        }

        public void AddAverageSpeedValue(float speed)
        {
            AverageSpeed = 0.99f * AverageSpeed + 0.01f * speed;
        }
    }
}