There certainly seems to be an increase in enemy spawn rate. However some of what you are seeing may (may) be just luck of draw like Invasion frequency.

If you stick around your base a lot you will see more invasions. I had 2 in 3 days but not one in the 30 days prior due to gathering time. When I was a experimenting with a small Trelleborg style Ring Fort as a possible future major structure I was near work benches WAY more. I'm in a full building phase now so I'm away gathering mats way more.

I never even had a forest creature attack.

Here are two large mid tier bases that are... heavily defensible. (the second one has dealt with several troll attacks with minimal damage. (pre H&H))

https://steamcommunity.com/sharedfiles/filedetails/?id=2607585554

https://steamcommunity.com/sharedfiles/filedetails/?id=2406822186