I just released a multiplayer car racing browser game (no registration) which is a cross between Agar.io and Grand Theft Auto.
You can find it at http://cararena.io
I'm looking for any suggestions or ideas, I just published it an hour ago, so it's fairly new.
It's a lot more agar than GTA, I would probably stop referencing it as a mix. It's just a car-themed agar IMO.
I'd also say that cars should drop "parts" when they crash into a building so that other cars have a reason to go anywhere near the buildings and to keep that "mass" in the ecosystem.
in agar, getting bigger has an advantage - splitting to get a smaller blob. Give cars a turbo boost option that resets their upgrade progress.
>Any ideas on how to make it more like GTA?
I don't understand the goal. When people think GTA these days, they think 3+.
Come up with some original gang names, have it so they have different goals - kill cars for one, pedestrians another, use the turbo boost, have "gangster" pedestrians to kill. Track the player's standing and give the car a skin based on who they're working for with each upgrade.