The strategy here is more complex than in the first levels. The end of this one is harder to speed up. The mobs keep arriving at the bottom of the map for much longer than at the top, and the spiders can waste a considerable amount of time due to their eggs are invincible before they hatch. What's more, they spawning very far away and even out of range of gunners. The technique was therefore to optimise the distance as much as possible by using Big Bertha which have rockets that can hit anywhere on the map. And to take Alleria instead of Ten'Shi. Although Ten'Shi was very useful, but he didn't hit from a distance, so Alleria optimised the end of the run in this case. What's more, at the very end, when the top is secure, I hasten to sell the towers in that area, so I can buy as many Big Bertha as possible to do as much damage as possible as soon as the last spiders spawn. What's more, saving a fireball before the end so you can launch it at the right moment and spawnkill spiders at the end to saves a few seconds.

What's more, I think the barbarians at the start of the game are very useful for air troops (Alleria also helps out in this respect). I really think a sub 11:20 is possible.