Help with custom portal gun

Hello there!

So I am not the greatest when it comes to more advanced arduino code (or Tuesday for some of you). Because of this I was wondering if I could get help modifying the code for a portal gun project I am wanting to build. In this case it isn't any normal portal gun. It is the portal gun from the Portal 2 mod "Portal Stories: Mel."

Code Reference: https://github.com/Lunchbox7985/Portal-Gun

PSM References: https://youtu.be/XWIzPGqV0PM at about 1:40

The "problem" with this code is it is mimicking the portal gun seen in the base 2 games. Here is a few bits I need to add for this to work.

1. When the portal gun hasn't fired/when the base portals have disappeared, the portal gun has a beam of green/blue light coming from the inner tube unlike the main game where it is just some kind of indicator.

2. I would like add a switch to change the boot up sequence between base portal and portal mel. Mainly because of how long the start up sequence is in mel but I want to have it to show off!

3. Everytime the light beam is on I would like it to look a little unstable, I am considering replacing the 2 neopixel jewels with a strip but that is still up in the air

I know updating the sounds and such will be easier but getting the lights to work the way I want it will be the issue. If anyone is able to help with this that would be greatly appreciated. I hope this isn't too much of an ask. I would just rather ask people who know what they are doing rather than asking something like chatgpt

Thank you for taking the time to read this!!!