Great concept and fun. The AI works well, but can be annoying at times since the red and greens runs always run away.
Thanks for the feedback.
The red tank will run away when he's almost dying, or if he's weaker than you. If you spend most of your upgrade points increasing your "Max Life", most reds will start always running away from you. You can minimize this problem by spending points upgrading your "Movement Speed", making it difficult for them to evade you.
The green tanks are able to dodge bullets. You can minimize this problem by spending upgrade points in your "bullet speed".