Getting the bot speed and behavior to fit one's level is tricky. I spent all day just tweaking a few bots and still not happy with them. Just how deadly you want them is a fine balance since no one wants to die over and over but it shouldn't be too easy either.
I look forward to seeing how all the improvements play out.
Right now in my new level, you can stand in one spot and shoot the whole level and win. I want to make it harder. I might make the enemies faster and make it so you have limited ammo.