Alias 'The Magpie' drew me in quickly, with its very English tone and sense of humor. I found it cleverly-written, well-implemented, and a lot of fun to play.
Like last year's The Wizard Sniffer, as the story in Alias 'The Magpie' unfolds it keeps raising the comedic stakes higher and higher in ways that leave you thinking, "How is this all going to hold together?" But it does. Does it ever: I have rarely laughed so much playing an IF game! J.J. Guest has already demonstrated a fine-tuned ear for comedy in To Hell in a Hamper, but it's clear he's gotten better with time: Alias 'The Magpie' is longer, features several more characters, and has a much more complex plot, but that comedic fine-tuning somehow manages to be even more on pitch.
My one critique is that I think a couple of the puzzles are rather difficult for a light comedy game. But this is a minor critique in what is a truly excellent parser comedy - one of the best IF comedies I've ever played, in fact.