Day 1 of testing is still underway, but over the past few hours... well, in the words of Glados:
"I'm making a note here - Huge success."
Most of the problems we had today were partners abandoning eachother, which I plan to fix by installing "Go back" buttons in case you accidentally ditch. I also will put a lobby button on every level, so you can always go back. Level select rooms are in the making soooo...
Also, I'll make a small tutorial area so people can get their bearings.
Anyway, I have to say, for a first test, today is going great.