the circle td map is indeed terrifying.
but a few things annoy me:
-newbie's, yeah well you get the idea. they dont have a clue how to start an die from the consequence's.
-the tips come by for just a single time per game, -the first tip doesnt help the starting newbie's, i generally have to tell people to build 2 (5g cost) tower's) on either side of their townhall's each game.
-the massive file size, needless to say... you need to advertise constantly, the game name: ''BestTdEvar!1,35mB B Patient'' seems to work well and some people already know the map when they join but it still takes a while to gather people under circle td's banner.
-the 5/20gold tower's become obselete very fast it's more efficient to sell them for 80 gold tower's and eventually fire tower's.
i would suggest:
-the first tip to give an initial build order
-warning 2 wave's before an invisible wave if you didnt make invisible tower's.
-the giant pillar's are wicked, they are efficient for their cost but upgrading them is not efficient.
-tip's under f9
-either fix the splitting or make the forgotten merchant permanent after unlocked.