3rd Person Movement / Camera Control Help or Advice Needed

Hey,

I'm relatively new to Unity and the forums (so I apologize if this question is a rookie one). I have a problem that I've been stuck on for days. I've looked through many YouTube videos, Unity forum posts etc and I just can't find what I'm looking for. I'll try my best to explain it...

Me and a friend are creating a modified replica of the indie steam game "What the Box?" for a school project. For those of you that haven't heard of this game, here's the link which shows the type of 3rd person movement that I'm trying to replicate.

What the Box?:

https://www.youtube.com/watch?v=LWiVoVdL9ig

So at the moment, the camera is positioned behind the player box. The box rotates horizontally using a mouse follow script and the WASD keys move the box forwards or backwards depending on where the character is facing. The box can also strafe sideways. So the problem that I'm having is, I have no vertical movement associated with mouse movement. I don't require a full vertical orbit of the box, just a slight orbit to provide enough of a view over the top of the box so that the player can shoot uphill.

Any tutorials, guides etc mostly use the Unity Standard Assets third person controller which is not what I'm looking for (all of the guides that use Ethan are focused on humanoid movement for replica shooters like Counter-Strike). I haven't found anything regarding the type of movement that I need and I'm really stuck at this point.

Here is an image & GIF of the stage I'm at and the problem that I am facing:

Image: https://i.imgur.com/8e0yNPE.png

GIF: https://i.imgur.com/7z6CS5E.gifv

(Note how the camera has no vertical mouse movement (which I also need) - only horizontal).

The scripts that I am using are as follows:

Attached to Camera:

https://pastebin.com/pzfWz8ys

https://pastebin.com/CKCtwm8u

Camera Inspector:

https://i.imgur.com/nbSZJR4.png

https://i.imgur.com/09VIlF4.png

Attached to Player:

https://pastebin.com/gm2pfbec

Player Inspector:

https://i.imgur.com/vWEGZYi.png

https://i.imgur.com/09VIlF4.png

In the past I managed to get the vertical movement working but it would tilt the actual box (player) in the game to look upwards or downwards and break the horizontal mouse movement completely; I wanted to freeze the box but just have the camera orbit up and down but I couldn't figure out how.

Any help or advice would be greatly appreciated! I'm still learning so I'm sorry if me or my friend made some rookie mistakes.