To be honest I hated the first one, but I decided to give this one a try and now I love this one! I always build my team by putting 3 gorillas in the front row and then I put 2 mandrill and a chimp in the back.
more towers and abilities that you can buy, like ants get a short, sudden burst of strength every minute because they are strong, or mosquitos reain some health when they kill an enemy. Be creative.
if you could, make it so where that when its time for the next row of "monsters" to come out, they dont appear until your current line is gone, because i have been drawing lines and then they just vanish because of the timer