looks and plays great! minor things would be:

1) I fizzled the radio in the first room and it kept playing 'Exile vilify' after it disintegrated.
2) when Glados was knocked out, I could clip through her big hanging head
3) Audio seemed really loud...maybe that's on my end but I had to turn the volume down for this one and didn't on any of the other maps in the series

That's it! Great work! Congrats on releasing/finishing this project!

As shown in the video in my comment, it is possible to press both buttons without using portals. It is tight enough though, so it should not be changed.