Food

• Vegetal food is now more abundant.

Virus

• They are now less probable to appear.
• A cell can pass a virus to another one when colliding.

Cell behaviour

• Carnivore cells are now more aggressive
• Any cell with the ability of attacking will deal damage to another cell with colliding.

Your ideas

I'm considering adding what I imagine as "bushes", essentially a static object that releases vegetal food periodically, to make it easier for herbivorous cells to eat. What do you think about it?