Everything looks really cool!
As the other replies said, I would recommend making it a bit more oval. I guess a lot of us are so used to the game Portal’s portals. But you could also justify it cause most avatars are more vertical instead of even on all sides, so it would be best to “accommodate” for that. Unless you are jumping head-first into it lol
I can kind of see where you’re coming from with only having the sparks come from one point, but I would say to add them in a few other spots as well. Or just have them all around, like a Dr Strange portal - but maybe not have as many sparks for better performance.
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