ScoreSystem.cs

public class ScoreSystem : SystemBase
{
    public const int BaseScoreMultiplier = 10;
    private EventQueue<ScoreAddedEvent> _addScoreQueue;

    protected override void OnCreate()
    {
        _addScoreQueue = World.GetOrCreateSystem<EntityEventSystem>().GetQueue<ScoreAddedEvent>();
    }

    protected override void OnUpdate()
    {
        var events = _addScoreQueue;

        Entities.ForEach((Entity entity, MatchedEvent e, DynamicBuffer<SelectionBufferData> selectionData) =>
        {
            events.Enqueue(new ScoreAddedEvent
            {
                Source = ScoreSource.Match,
                Value = (int)CalculateScore(selectionData),
                Origin = selectionData.Last().Position,
                ChainSize = selectionData.Length
            });

        }).Schedule();

        Entities.ForEach((Entity entity, ExplosionEvent e, DynamicBuffer<ExplosionHitBufferData> explosionData) =>
        {
            events.Enqueue(new ScoreAddedEvent
            {
                Source = ScoreSource.Explosion,
                Value = (int)CalculateScore(explosionData),
                Origin = e.Origin,
                ChainSize = explosionData.Length,
            });

        }).Schedule();

    }

    private static float CalculateScore<T>(DynamicBuffer<T> matches) where T : struct, IBlockDefinition
    {
        var score = 0f;
        for (int i = 0; i < matches.Length; i++)
        {
            var m = i * matches[i].BlockDefinition.ValueMultiplier;
            score += m * (1 + BaseScoreMultiplier) * m;
        }
        return score;
    }
}