Thanks!
I now realise what went wrong with the turret malfunctioned aim (Rather than adding 45 deg. aim offset to final angle, I should have changed the offset of the destination of bullets, that way you could aim everything right just by aiming a little left or right to the target, rather than moving your turret around as you move further or nearer to the target) but I guess it made the game quite more challenging, or frustating?
I will fix it in post-jam version :)
Thanks for the tip!