This is super impressive! Funny to see a 64x64 game actually getting the fans going on my graphics card lol (I am assuming that's because it's unreal engine?). You did a really good job of adapting both the visual style and audio style of portal. The audio queues for things like the electric gates switching were spot on.
I did have a bug-- the first room you do after getting the portal gun, I somehow managed to portal the cube in that room out of existence, so I was unable to continue (unless I missed something)