Thanks for the feedback. We plan to implement the mouse lock in the polish phase, so it's good to hear that many people are asking for it and that it would help out their experience. My main concern was not being able to unlock the mouse, so until we get the pause functionality working again (which would unlock the mouse), we decided against locking the mouse (since then the only way to regain control would be an alt tab or hard closing the program - considering you may be playing in the browser, the alt tab may not be very intuitive). It's the top priority on our list for sure since we want it to be very easy to control and aim.
I will adjust the timings on the camera transitions - I agree that some are very slow and could be sped up or turned into hard cuts instead. Regarding the turret and railgun timings, at present you cannot fire the turrets while the railgun is on cooldown - this was a deliberate design change but is unintuitive to users, and with no audiovisual feedback letting you know that you cannot fire due to being on cooldown, it can lead to frustrations. I plan to separate them so that they can be fired independently and not be reliant on the other being off cooldown, and possibly implementing some kind of feedback if the user tries to fire while on cooldown (ie some kind of error sound and a red glow around the cooldown indicator).
There will be UI control for the aim mode to let you know that you can use the mouse to turn the ship in aim mode as well, not to mention strafe in any direction (which is currently bugged and not strafing based on current direction). The mouse aiming will also work better once the mouse is locked to the screen.
The railgun has infinite range - so if you can line up a shot against an enemy, you should be able to hit them (they'll be aggroed to you too if they didn't die).
Glad you liked splitting ships with the railgun - I laughed myself the first time we had it working. It's also fun to finish them with the turrets because the ship parts and projectiles have physics, so you can shoot around their pieces before they disappear!