Feedback wanted: Some questions on Ending (spoilerish)

[Frictioned]

I got the revenge ending.

When entering the room nothing much happened, so I explored and found the pylons were unstable. I wanted to toss Agrippa's head but just got a message that the portal wasn't open yet so I pushed the pylons over thinking that would open up the portal. Instead it destroyed it and Alexandra was consumed.

I reloaded the area to try to find another way and this time waited but nothing appeared to happen, so needless to say I got the same ending again!

I felt the ending was a bit underwhelming, with little choice, and no reminder of how to use Agrippa's head which felt like a waste, but certainly didn't ruin the game.