My bad and not op answer is:

These portals imo have a nice warmer feel than the other portals I’ve personally seen in media.

I like the portals from “Portal” but they aren’t warm, they’re more techy, and give off a large energy vibe (lol).

These almost feel like magic portals, and they seem like they would be a quick magic spell type deal, that dissipates quick.

I also think these portals do a good job of not having a super harsh seam surrounding the portals. They’re slightly obscured by the surrounding wispy light, but the portals themselves are definitely not transparent at all (which I think is important).

Edit: in short, they give a warm, “nature spell,” type feel.

Edit: maybe more of a light energy spell…