The game was designed so that you have a certain number of attacks per round and then the organisms multiply with each new round, i.e. you have to kill the attackers faster than they multiply. To do this, you have to draw large circles and the trick is to draw them in such a way that as few of your own cells as possible die.
The high score should therefore come when you have defeated all the evil organisms and not when you spontaneously decide to end the game.
It was also intended that you would carry out the attack by releasing the mouse button, but some of the team found it better with an additional button.
Thanks for the feedback!