I'm actually surprised how easy the levels 5 - 10 on hard have been. I recall having much more trouble on some of the easy and medium difficulties sometimes.

So this level probably has many ways to clear it and in hindsight mine was probably not very efficient with so many swamp towers.
But it was just so easy that it didn't really matter what I did. I just wanted to show your this screenshot in the case that you could not finish it, this at least works for sure and does not require much micromanagement at all.



As you can see it's a simple build and I think just using cannons or tesla would have worked too.
This needs no further explanation I think you will notice how easy the map is.

Good luck & if you found the guide helpful please rate it up:)