I hope the title doesn't sound like some kind of Minecraft mod...
Okay, so once I started goofing around with portals, I knew these things needed some fixing. I really actually like the circular movement if there's multiple ones of the same color, and I'm sure some other people do, too. So, here's what should be done:
-A type of portal that has the circular movement
-A type of portal that links with the next one of the same color, all others are ignored
This next one is just a maybe feature.
-See through portals
Also, there are some bugs like not teleporting soon enough and you see through the wall. Portals in other chunks not being teleported too.
There is one genius part about the portals I love, though. If you teleport through a portal and 2 blocks ahead is a block, it is destroyed. 1 block ahead is not, but rather passed by. This is genius for adventure maps and one-way portals. I don't know if it was intentional or not, but I say keep it.
That's all I have to say.