Hello! Yep, I also noticed how similar it felt to diep.io after making them. My first plan was to make them attack the nearest enemy but I decided to change that up since it would be more tedious to code and it's probably more fun to have them follow your mouse.
Also fun fact, the firewalls actually do have a limit. They will skip their wave if there are 24 or more red bits. The player also doesn't spawn more than 8, but that got irrelevant when I gave the blue bits lifespans.