ComponentDatas.cs

using Unity.Entities;

// 実体
public struct CountData : IComponentData
{
    public int count;
}

[System.Serializable]
public struct RangeData : ISharedComponentData
{
    public int min, max;
}

ECSMain.cs

using UnityEngine;
using Unity.Entities;
using Unity.Collections;

public class ECSMain : MonoBehaviour
{
    [SerializeField] RangeData range;

    EntityArchetype sampleArchetype;

    void Start()
    {
        var entityManager = World.Active.GetOrCreateManager<EntityManager>();
        sampleArchetype = entityManager.CreateArchetype(typeof(CountData), typeof(RangeData));
    }

    private void Update()
    {
        if(Input.anyKey)
        {
            var entityManager = World.Active.GetOrCreateManager<EntityManager>();
            var entity = entityManager.CreateEntity(sampleArchetype);
            entityManager.SetSharedComponentData<RangeData>(entity, range);
        }
    }
}

RangeSystem.cs

using Unity.Entities;
using Unity.Collections;
using Unity.Jobs;

[UpdateAfter(typeof(CountSystem))]
public class RangeSystem : ComponentSystem
{
    struct Group
    {
        public int Length;
        public EntityArray entities;
        [ReadOnly] public ComponentDataArray<CountData> countData;
        [ReadOnly] public SharedComponentDataArray<RangeData> rangeData;
    }

    [Inject] Group group;

    protected override void OnUpdate()
    {
        for (int i=0; i<group.Length; i++)
        {
            var range = group.rangeData[i];
            var data = group.countData[i];
            if ( data.count >  range.max || data.count < range.min )
            {
                PostUpdateCommands.DestroyEntity(group.entities[i]);
            }
        }
    }
}