you were right about doing everything correctly, but you absolutely shouldn't touch the starting quest 'kill everyone' - otherwise, you'll mess things up and it will lead to failure - win or fail after completing any quest :smile33:. You can make it invisible. Create a new quest in the Objectives tab and experiment there.
Yes, it really helped! I created a new objective, put the same conditions there, and in the first one, I set it to be immediately active but invisible.