If you want use ← ↑ ↓ → and Ctrl as FIRE choose Kempston Joystick.
Keyboard: 0, P, ENTER, SPACE - 4 view angles, SYMBOL SHIFT - Rotate clockwise, M - Rotate anticlockwise, V - Forewards, C - Jump, S D F G - Throw grenade short-long distances, 1 - Last resort, returns you to the city gate