Blue Portals is a unique Portal mod that has players traverse through new test chambers using only the single portal device and many new test elements.
What made Portal great was while it was certainly challenging it was easy once you figured out what to do. The main problem with basically any Portal mod i've played is that you know what to do but no matter what you do you can't do it.
Any Portal mod that requires crouch jumping, having two portals next to each other and forming a circle that makes you go higher is just frustrating to play in my honest opinion.
Sadly this mod falls in the same category as Portal Prelude and Gamma Energy, really good looking Portal mods, but incredibly difficult to play
Maybe I'm just a bad gamer but the difficulty with this one really drives me away from it.
Enough of the bad, now to the good I am impressed with the new cubes and magnets, I would encourage when the day comes to use them in a new Portal mod along with the new elements in Portal 2. That being said however, you really should turn down the difficulty just a tad