No problem that's totally understandable ^_^ and yeah if you wanted to go for realism it makes sense that there's no sound.
For the aiming i think to have it be more precise i'd either go for mouse aiming or if you want to have controller compatibility maybe go for a twinstick type of controls and i'd probably remove the "spring - y ness" that straighten your aim automatically.
Then again your game your vision ! just my opinion XD