Wow, didn't expect you here!
Thanks for the feedback, it's always nice to see another Splatoon 2 fan.

Hmm. This looks oddly familiar.
Nice music choice btw ;)

user created packages. it's a console command, ecxample changing conversion gel would be portal_paint_color 255 255 255 255. r,g,b,intensity

Interesting. So how did you do the purple reflection gel thing? Is it something I can do in bee2 or do I need to use hammer and other advanced stuff? And what are UCPs? I'm new to this.

I used a few UCPs. One changes the color of Reflection Gel to purple, another adds worldportals. The worldportal entrance () is sideways, but the exit () is normal. This gives the illusion that you are walking up the wall. When you jump back through, you retain your height.
It's also recessed by 1/4 voxel so that you can walk on it.

How did you do this?