Having problems with creating functions that repeat in my game, help please D: !!!!!!

I'm making a simple Shoot 'em Up game, started to use functions and ran into some troubles

So the enemy shark is supposed to spawn 15 times before wave 2 happens, but what ends up happening is only one shark spawns and the inimigosSpawnados is stuck with the value "1"

I believe the problem is on the "every 2 seconds" not being implemented correctly, but I don't know how to implement it correctly

please if you know how to fix this, or even a better way to implement waves (I'm still kind of a beginner), do please tell i would apreciate it very much :DDD

The way you are using functions is very wrong. Functions should be at the top level, avoid nesting them under other events or conditions. Also, "Every X seconds" inside the function won't work.

And that chain of functions calling each other is completely unnecessary..

Say, you want to spawn a new wave of sharks every 2 seconds. And each wave should contain 5 more sharks. Then you can do something like this: