I've put a good few hours into the game now, but I still can't quite get used to the missiles not launching by default from the front of the ship. For example, let's say that I'm just moving around targeting stuff and then things go quiet and I forget which direction I last targeted, I'll often then attempt to launch some missiles in the direction I'm facing, but instead they'll be set to the direction that I last aimed. This behaviour seems unnatural on the joypad, although using a mouse it's not a problem because you don't have to pre-shoot to calibrate your aim.
The way my brain expects the missiles to work is that when you press fire missile it always launches from the front of the ship, with no turret aiming involved. If this were the behaviour, that's not to say that the missiles wouldn't be aimable at all, it's just that the missile would need to be aimed via manoeuvering the ship into the correct trajectory instead. In this way, targeting missiles would be more like going on attack runs with your ship. This seems like it would be a more interesting way of targeting missiles, and it would allow you to do natural multi-directional firing. For example, I could be zipping along to the right while firing behind me and launching missiles to the front. With the aiming being trickier you could really ramp up the power of the missiles and make them much more satisfying when you score a nice hit.