Thanks for the comment, and for playing, but at least for me the controls are working as they are supposed to. They mimic the contols in the 1983 arcade game. It is easier with a joystick, but it works like this:
A always move the fighter to the 9 o'clock position
D always move the fighter to the 3 o'clock position
W moves the fighter to 12 o'clock
D moves the fighter to 6 o'clock
Similarly A+W moves to 10.30, W+D to 1.30, D+S to 4.30 and S+A to 7.30.
So to move the ship around the clock (clockwise) you need to press A-W-D-S in order and time the switch to get it smooth.
I admit it is a bit un-ortodox but that's how it is supposed to work. In hindsight I should have added an option to have more ortodox controls.