Increasing Spawn Rate as Game Goes On

Questions & Answers
1

Hi. In my game I have a player climbing up a wall and objects fall on the player. (Credits to @static_cast). I was wondering how I can increase the spawn rate of the object every 30 seconds. In other word to make more objects fall as the game goes on. How should I do this?

2

Hi again, take a look at this code. I have not ran this so maybe there is a typo somewhere :

private var fSpawn_Speed : float;

function Start() {

    //Set initial Spawn Speed
    fSpawn_Speed = 10f;
    
    //Start Spawning.
    InvokeRepeating("subSpawn_Object", 0, fSpawn_Speed);
    
    //Start the Spawn speed adjust in 30 seconds.
    InvokeRepeating("subIncrease_Spawn_Speed", 30, 30);
}

function subIncrease_Spawn_Speed() {

    var fSpeed_Increase : float = 1f;
    
    //Cancel the current subSpawn_Object Invoke.
    CancelInvoke("subSpawn_Object");

    //This will limit the spawn speed to a min of 1.
    if ((fSpawn_Speed - fSpeed_Increase) < 1) {
        fSpawn_Speed = 1f;
    } else {
        fSpawn_Speed = fSpawn_Speed - fSpeed_Increase;
    }
    
    //Restart subSpawn_Object with new repeat time.
    //You may want to adjust for the time since the last spawn
    //by setting up a time since last spawn var and using that
    //calculation rather than 0.
    InvokeRepeating("subSpawn_Object", 0, fSpawn_Speed);
}

function subSpawn_Object() {
    //Your Spawn code.
}
3

Here’s what you could do:

private float nextDrop = 0f; //The time for the next item to spawn
private float dropInterval = 10f; //The interval between spawned items
private float changeInterval = 30f; //The interval between changing the interval between spanwed times. :P

void Update()
{
    if(Time.time >= nextDrop) //If ready to spawn
    {
        SpawnObject();
        nextDrop += dropInterval; //Set next spawn time

        if(Time.time >= changeInterval) //If ready to change spawn interval
        {
            if(dropInterval > 1f) //Change spawn interval to 3/4ths what it was
                dropInterval *= 0.75f;
            else //Make sure dropInterval stays above 1.
                dropInterval = 1f;
        }
    }
}
4

Download this free asset in which there are 4 games.
One of the games uses Spawn function which is what you need.

C# game examples by M2H

Unity Asset Store - The Best Assets for Game Making Play the Egg bucket Game ( thats what you need )