I’ve filmed another how-to video:
This one is about increasing (or decrease) the difficulty in your game over time. This vid focuses on 1) increasing enemy speed over time and 2) decreasing enemy spawn time over time. Both of these are “clamped” to a max or min value.
The same technique can be used for any numerical value in your game that you want to change over time.
Other videos in this series are here:
As always, feedback and suggestions for future content are welcome!