The more there is, the more fun and difficult it gets

This is the zombie survival game I'm working hard on right now. Because I'm changing the amount and types of zombies that appear with each wave, I'm manually entering commands one by one. I plan to make 20 in this picture, and eventually 50... but I still have 30 to enter + I'm increasing the count every 10 waves, so it's hell, isn't it? I want to make something fun, so it's okay, but the process is really tough~