I like maps with huge emitters and lots of space.
But there's an inhibitor and AOO's that make it too easy. :P
Even though you can't launch a convert/freeze directly on the inhibitor...
Spoiler
You can hit two converts pretty close to it, then use the singularity weapon with ~400 charge to draw the rest of the creeper away, leaving it unprotected.
I'm also not a fan of having to pick up irrelevant things like the Thor at the top of the screen which I didn't see until after I'd killed the inhibitor.
Cool idea though - would be more fun & challenging for me without the AOO's or the Thor, but perhaps not for everyone since a lot of people have times that are well over 20 minutes. Guessing if I'd paused and saved a bit I could hit under 7 minutes but dunno.
Thanks for the map! ;D