Regarding @Barcodes proposal on pyramids, I've tested some values and I've made a pull request with the following changes:
1. Temple of Amun's healing range increases from 40m to 70m. This is because the building itself occupies most of the area within its aura, so there is not much space left for the units to be healed, espcially on the corners. Increasing to 70m gives ample space for units to stand nearby and heal.
2. Large Pyramid aura range increased to 100m. This radius is approximately the width of a late game army (120~130) units in close order formation. The previous 70m is too small to affect the whole army, especially considering the size of the pyramid itself and the likelihood of buildings / complicated landform around it. 100m should give sufficient space for the aura to have a strategic impact. However, 140m or greater values might be too OP, so let's be conservative here. The idea of the circular aura is being able to use this building to give you an advantage while invading an enemy bordering you; you are covered by the aura even when you are inside enemy territory. Similarly, it provides you with an advantage at defending against incoming attacks, which is what Kushites are weak at.
https://gitea.wildfiregames.com/0ad/0ad/pulls/7963