I have been really busy with Dota 2 lately so this hasn't been my number 1 priority 
[Coop] Tough Trio
I wouldn't use music though, I found it a bit annoying in the background, you're busy chatting with your partner anyway.
And I would change the order of the maps. I would place the 2nd one as first, then the 3rd one and then the one that's currently the first one. That would be a sorting according to how we judged the difficulty.
E: No more music, I agree it was a bad idea for a coop map.
I love Portal and want to collect some gameplays (first blind runs; always aren't the fastest and intended solutions, because I take any time to look at the map and its possibilities), speedruns and bug reports.
My records should help you to understand how the player thinks.
Well, I hope I can support you with my uploads to fix any bugs and make new awesome maps.
Here are yours!
Gameplay:*
QsN94104dlo
If you like it and/or it helps: THUMBS UP* 
opinion & comments: great little puzzles ...stage 3 need an update 
THX for mapping...
Keep it up!
PS: I began to record our voices, because later i want to make commentarys. Please switch off the sound of the video if it's annoying.
E: Made some quick fixes