Thank you for such an in-depth comment, I'm very flattered!
You are correct about the civilians spawning, so there's a bit of a race against time to kill as many people as you can as quickly as possible before it starts getting too crowded.
Also I'm glad you appreciate the delay when killing, it's definitely an intentional choice to balance out the game. The rage mode is a fantastic idea and I do agree that something like it could help out a lot in that sense of slowness some people have mentioned. I actually had similar ideas to what you said but in the end I just ran out of time before I could implement any of it lol
Happy to hear you had so much fun playing!