void OnUnitCleared(UnitCreep creep)
        {
            int waveID = creep.waveID;

            activeUnitCount -= 1;

            Wave wave = null;

            if (spawnLimit == _SpawnLimit.Finite)
            {
                wave = waveList[waveID];
            }
            else if (spawnLimit == _SpawnLimit.Infinite)
            {
                for (int i = 0; i < waveList.Count; i++)
                {
                    if (waveList[i].waveID == waveID)
                    {
                        wave = waveList[i];
                        break;
                    }
                }

                if (wave == null)
                {
                    Debug.Log("error!");
                    return;
                }
            }


            wave.activeUnitCount -= 1;
            if (wave.spawned && wave.activeUnitCount == 0)
            {
                wave.cleared      = true;
                waveClearedCount += 1;
                Debug.Log("wave" + (waveID + 1) + " is cleared");

                ResourceManager.GainResource(wave.rscGain, PerkManager.GetRscWaveKilled());
                GameControl.GainLife(wave.lifeGain + PerkManager.GetLifeWaveClearedModifier());
                AbilityManager.GainEnergy(wave.energyGain + (int)PerkManager.GetEnergyWaveClearedModifier());

                if (spawnLimit == _SpawnLimit.Infinite)
                {
                    waveList.Remove(wave);
                }

                if (IsAllWaveCleared())
                {
                    GameControl.GameWon();
                }
                else
                {
                    if (spawnMode == _SpawnMode.Round && onEnableSpawnE != null)
                    {
                        onEnableSpawnE();
                    }
                }
            }
            if (!IsAllWaveCleared() && activeUnitCount == 0 && !spawning)
            {
                if (spawnMode == _SpawnMode.WaveCleared)
                {
                    SpawnWaveFinite();
                }
            }
        }