The fur could be fiber optic, those change color. You could also add some kind of indicator light. I just think it would make the character look better if something on it changed because of the heat. You could use that instead of the HUD bar to make it a bit more immersive (mike sure it is well visible), and maybe some kind of venting system or coolant pickup. You can slow the look_at() of an enemy by applying it to a hidden child object and then using rotate() or rotate_y() to apply the y rotation of the child object to the parent. You might have to multiply the rotation to change the speed, but having enemies on your tail from the start is a bit hard. Also, add a max enemy cap and use the slower rotation to allow the player to get behind and earn more points or a special kill. Just some ideas from what I've been working on.