What I've done is, in addition to making the fast-chasing enemy move slower when you aim at them, I've also made them a bit smaller, to provide some visual feedback and prevent them from being too easy.
Regarding the patrol pause, yes, that's the idea—to scale it according to the turning angle, although for now all the new directions result in a 180º turn.
As for the keyboard focus issue, the main menu makes it so you explicitly click the play button, thus achieving focus and then moving with WASD. But thank you very much for taking this into account and alerting me to these problems, which, from what I can see, are common here.
Thanks again for your feedback!

