I crouch-jump like a motherfucker. In fact, I stay nearly crouched all the time. Not only does it make me about a third the size, but crouch-jumping when aiming yourself upwards gives you much more speed and distance than regular jumping. Strafe-running is also faster than regular running. Combining the two is the most basic way to increase your speed. I don't recommend leaving this on permanently, but you can explore toggling crouchmode on and off by going to the console, deleting SAY, typing in CROUCHMODE 1, re-typing SAY and pressing Enter (doing the same with CROUCHMODE 0 will change it back). This will make the crouch button a toggle rather than depending on holding it down.
There are also advanced techniques that gives you nearly
untouchable speed. These are imo imperative for players who want to win with the bug. Obviously, the minigun will tear you apart in literally less than half a second so you need all the speed you can get.
I have a whole video demonstrating these techniques and showing how do them: https://www.youtube.com/watch?v=Q-cslGY0_DQ
I'm thinking of making a proper guide for the alien. Do you think that would be of any use? If so, does anyone have any suggested questions I would answer? I've been told my "how to play as the alien" tutorial starts off immediately with the more advanced stuff, which, looking back on it, I admit is pretty true.