When the garbage forcefield gets disabled, one of the 'bots says something about security forces. I personally would like having the ability to fight off lots of robots, without needing to start endless mode.
Just a suggestion.
Kind of like the cliche "He was just a clone! The real one is not here!"
(That is if it's going to actually be beatable and not one of those mobs thats just there to kill and not to be killed. Kind of like the arena closers in diep.io)