How do I make the game go to the next level only when all of one object is gone? I know how to make it go to the next level if one of them is destroyed, but I want it to wait until all of them are.
One way could be to send a message to your player each time an object is destroyed, and when the message is received, increment a counter.
Filter the output from the counter, and if the count is greater than or equal to the total number of objects, then go to the next level.