サブスクライブしてダウンロード
A Bit Less Than Impossible(MP)

Alright, it worked. We used the (blue) funnel to slow the player down who came from above. Additionally, we arranged a cube sacrifice to turn the orange funnel back into the blue one, so we brought the new cube from above . Is this correct?
Btw after some attempts jumping in a diagonal line from above also worked :-P Not easy to pull off, but possible.
We needed 2h20mins altogether four our blind run. I will see how I cut this down one day and if you like I can provide the link then. (please note that it's with German commentary)
Without a doubt, the map is challenging. I think it also is free of any softlocks. But there are situations that make it hard to see what does what respectively when and why to do what. The player has to analyze a lot - and guess a little.
My opinion:
Difficulty 8/10
Overall rating 6/10

I think I got something in my mind. It doesn't comply with everything you mentioned, so I'm not sure by now. I'll check it out next weekend when my coop partner will be available again.

Oh, and about the usefulness of the funnel - don't forget that you may change its polarity not only with an object, but with one of the players as well

Just a small edit: be very careful! Don't "die" too early, make a deep thought first.
Once the cube and a ball are near the exit - they must stay there.
Btw, you will probably find those pedestal buttons near the start of a funnel quite useful...

It's actually pretty easy if you know the drill. You're going in the right direction. And the hint, not to make it too obvious...
Well, let's say that this game mechanic can only be done in co-op. There's no way you could accomplish anything like that in solo. You see, when one have a portal placed, nothing keeps them from entering other person's portal... and it works in both directions.
Aaaand I guess you've already figured out how to get topside.
So, I'm hoping that this hint is clear enough, yet not too much. Good luck!
P.S. Tnx for your commentary, good to know that people find this chamber of mine and my friend's challenging and interesting as well :-)

We are clueless about the final move. We have one player and two items at the exit. We're pretty sure the funnel can't be helpful anymore at this point (since we neither can change polarity nor use the angled panel), so we thought about a portal connection from the beginning - but it was just impossible to reach the exit with a jump. Can we get a hint?
(to be clear from the beginning: I'm not asking for insults, please keep it fair)

I really liked the puzzles on this map, I had to break my head .Yes ,there were some non-obvious moments, but they became part of the overall task of care and study of the entire environment .Great map good job

The map has been carefully tested. Be sure that it's solvable without ant cheats! Think well, and good luck!