This run was completed after just 3 attempts. In my opinion, a sub 10:25 is more than possible.

This level is a bit like Icewind Pass in that the maximum amount of time you can save is at the end of the level, as the skeletons keep coming out of the graveyard until you've killed the knights.

The soldiers have a lot of physical resistance, so wizard tricks are essential to finish them off quickly. When that's done, I think you need to sell as fast as you can and put in towers of archers that attack very quickly. Big Bertha can be an option, but I think they'll be too slow in this case. The sorcerer's tower with the golem packs the knights into a precise location where they will take the most damage.

I tested Alleria and Ten'shi on this level and in my opinion Ten'shi is the best. He gains levels much more quickly and is a much better tank than Alleria, which means he can kill knights more quickly in the end.