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I'm not positive, but this appears to be broken. I'm not sure if something supposed to be happening, but nothing seems to be going on.

(+1)

Found the issue, thanks for pointing it out! Press P when you are ready for the first wave. There's a problem with the grace period never ending.

I say that and then they start spawning. It should take about 4-5 minutes to start spawning. Maybe try waiting a little longer if you can't use the P wave spawn key.

Thanks for the update!