A custom, but unrefined maze I normally build for defender. Aside from the longer path time of the standard spiral, it combines the best of both a centralized race, but also has a bit of range so that Sas aura doesn't cover the entire maze at once, as is the problem with most spiral mazes.

Towers 1-10 represent additional towers for those +10 races. #11 and 12 could be possible juggle towers that I only spotted now. Could work for small but heavy (boss) sends.