Lol i'm also stuck on the 7th level (I will beat once I it once i get back to my desktop with a mouse), but I really like the level design with the blue and red walls in combination with the various levels. Aswell as the super fun abilities (i luv the bit spawning ability it reminds me of diep.io). Lastly I think you should have to kill the bits that are spawned from firecrackers first before another wave spawn, whenever you kill a last enemy that's a firecracker it automatically starts the next wave regardless if there are still bits from the firecracker.
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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.