I was wondering how to make things go faster with time. For example - let's say I have a canon who shoots every 10 seconds but after a minute I want the canon to shoot every 9 seconds and after another minute I want the canon to shoot every 8 seconds and so on. I am trying to make a one-level game but it's not fun if it doesn't get harder and harder.
I hope you understand what I mean
Thanks in advance,