The Xen parts are secret, so any suggestions can be null.
But, about the Gonarch battle, i was thinking that it could be improved in some way.
Mainly the first part of the battle.
I was thinking of an arena like the ones seen in Episode I and Episode two were the player fights the “Antlion Queen?”
I thought of a circular area filled with destructible rock pillars with a healing pool in the inner part of that said area.
The area would resemble some type of alien ancient temple, with the healing pool surrounded by four undestructible alien “pillars”, like the moving
“towers” of Xen, only that these ones are smaller, a little bit taller than the destructible rock columns.
I thought about four or five layers of circling rocks columns around the central healing pool.
The level starts with Gordon in an open place where he sees the Gonarch, the fight starts and he escapes looking for a good place to fight.
As he retreats from Gonarch attacks, he reachs the forest of rocks that give him some temporary protection against the alien and allow for the killing of
baby headcrabs.
The Gonarch needs to hit the rock protections some times to be able to destroy each layer of rocks while Gordon can deal some damage to it.
Eventually, all rock protections are destroyed and there remains only the four circling pillars around the healing pool that would offer some protection until
enough damage is done to start the next round of the fight.