How would I make a projectile go flying in a "2D" space?

So I am making a small game, and I need a projectile to fly to the mouse in this “2D” space. I know how to make the laser go forward, but I just can’t seem to get to rotation of the projectile right while restricting camera movement. I haven’t really tried anything because I don’t know how to approach it correctly. Scripts are not necessary, but would be helpful if you feel like it.

Any response is appreciated!