I saw this guy who wanted apes versus helium in the game
And here i am going to help it while still keeping it fair. So when you make a game you get the options to turn on boosts, when you do that you will get into an little menu with different alternatives like how much health the bloon has or how many rounds you can play (i know there exist free play) And then you can example add that as the bloon you can get little helpers that will distract the towers and then with the AVH thingy you can add attacks and such.
I am not a coder myself so i do not know how hard it is but if you would take the time to do that i think many people would have liked it
Peace!✌️