This was actually easier than I expected

Here's a screenshot of the towers that I built.



The swamp tower in the top left was actually unneccesary I believe because there were no nicotine's.
So that's some extra cash that can be used as well And perhaps the top left melee tower in my setup could also probably be left out or placed elsewhere I kinda did not mean to place it there but I continoud with it anyways but the placement could definitely be better :P
In the beginning I put my hero right at the start of the spawns and later I will place him with my melee towers. All in All this map was very easy like this and it required no boosts.
And you can upgrade the generator right at the start and build two melee towers and 2 cannons for example is enough because your hero should be pretty strong by now.