Not sure if you've been inspired by Gig's maps or if it's the contrary, but I'm pretty sure I already used this mechanism in some map Gig made X) Good map anyway ;)

WOW ! i've never seen a that-hard only-blue-portals-level. nice! (but i don't think you had to build it SO big)

Multitasking in its finest form! I love it!

Changing the location of the button that switches the top portal to bottom would take much grief out of solving this puzzle as my cube kept corner-hitting my portals on top of the distance being difficult to judge from the angle. In the end I solved it by ninja dropping the cube through a portal on wall next to button while turning around and shooting a portal onto wall standing on button, because that was easier than the intended solution.

My reflexes are too slow, but good idea anyway.

Loved it. Great idea.

Ah, finally got it. Very good

lol, yeah, i do. Might change that.

You have a map called "Reversed" and a map called "Reversal"

EHHHH

Nice one.

good one... you need some quick reflexes but its a well done map

So...me yelling at you motivates you to make chambers? I'll keep that in mind!