Hey, thanks for trying the demo and I'm glad you like it. :)
Good to hear it ran smooth as well.
So, there's already two buttons dedicated to aiming up/down diagonally, by default it *should* be the shoulder buttons on controller and A/W on keyboard, otherwise you have to check the control configuration and then you can bind them to whatever you want.
Anyway, thanks again for playing and for the feedback. ^^