C# Unity , How I Can Increase speed of game-object in Y axis in (spawn wave) pair time unit ??

C# Unity , How I Can Increase speed of game-object in Y axis in (spawn wave) pair time unit ??

this is my code :

for a color game have 2 color

using UnityEngine; using System.Collections;

[System.Serializable] public class red { public GameObject redballObj;

 public int Count;
 public float Spawnwait;
 public float Startwait;
 public float Wavewait;
 

} [System.Serializable] public class blue {

 public GameObject blueballObj;
 public int Count;
 public float Spawnwait;
 public float Startwait;
 public float Wavewait;
 

}

public class gamecontrol_script : MonoBehaviour { public red red; public blue blue; public Vector2 SpawnValues;

 // Use this for initialization
 void Start () {
     StartCoroutine (redSpawnWaves());
     StartCoroutine (blueSpawnWaves());
 }
 IEnumerator redSpawnWaves ()
 { 
     yield return new WaitForSeconds (red.Startwait);
     
     while (true) {
         for (int i = 0; i< red.Count; i++) {
             Vector2 SpawnPosition = new Vector2
                 (Random.Range (-SpawnValues.x, SpawnValues.x), SpawnValues.y);
             
             Quaternion spawnRotation = Quaternion.identity;

             Instantiate (red.redballObj, SpawnPosition, spawnRotation);


             //Instantiate (rocks.blueballObj, SpawnPosition, spawnRotation);
             yield return new WaitForSeconds (red.Spawnwait);

             

         }
         yield return new WaitForSeconds (red.Wavewait);
     }
 }
 IEnumerator blueSpawnWaves (){
     yield return new WaitForSeconds (blue.Startwait);
     while(true)
     {
         for (int i = 0; i< blue.Count; i++)
         {
             Vector2 SpawnPosition = new Vector2
                 (Random.Range (-SpawnValues.x, SpawnValues.x) , SpawnValues.y);
             
             Quaternion spawnRotation = Quaternion.identity ;
             
         
             
             
             Instantiate (blue.blueballObj, SpawnPosition, spawnRotation);
             yield return new WaitForSeconds (blue.Spawnwait);
             
             
             
         }
         yield return new WaitForSeconds (blue.Wavewait);
     }
 
 }
 
 // Update is called once per frame
 void Update () {
     

 
 }

}