There IS a date with Katie after the comedy club, if you didn't get it it's because you fucked up somewhere with her.
But yeah, there's still one more chapter left AND epilogues for the various different paths (there's quite a few), so the game ain't done yet.
As for a Walkthrough, I guess it'll depend on whether someone wants to make one... pretty sure Cheeky's said he won't do one because of how many branches there are... and indeed, the one that is there, besides being updated, is actually not very useful for certain paths that require a lot more finesse... so who knows, maybe a brave soul will tka on the endeavour =P