yea kinda a bummer, but it was pretty well understood to be a single season going in. like there was always the chance they could convince the creators to pursue season 2 if it went well enough, but it was always only a possibility but not the expectation.
In alot of ways it's too bad, but in other ways it's probably for the best. it was so good and stands alone brilliantly, it addressed some interesting pen points to link to the original comic without relying on it entirely. I don't think it'd be possible to recreate that. I think a 2nd season would have to rely on a new story and set of characters, and it'd be nearly impossible to link it into the old stories and continue the new.
As an example compare how great the watchmen was versus how fuck awful doomsday clock was.
but still, what a cliffhanger to live with forever.
and all the open questions, like what's up with panda (and the pandas in looking glasses flashback)? I think it's meant to indicate a world view that's very black and white, panda couldn't release weapons without it being exactly by the book regardless of individual circumstances, or young looking glass seeing a christian conservative world as clearly either right or wrong - contrasted with much of the story centering around moral ambiguity, the gray area.
They apparently answered the lube guy in the supplemental online peteypedia (it was infact dale petey). But what's up with red scare and pirate jenny.
I sorta see red as just an indicator of the now very cordial relations between US and russia enabled by the squid attack that diffused the cold war, while pirate jenny is maybe an affectionate nod to the curse of the black freighter substory in the comics. But I still would enjoy more of their backstories.