I strongly enjoyed Polyaminous and Echolocation. I'd have enjoyed your most recent puzzle more if I wasn't stymied on it, though it was a good one.

Question--are you dead set committed to puzzles of the same format? I'll loosely define this 'format:' "A grid of squares; the object of which is to use the rules given in order to determine the contents of each individual square." (I took a page out of your book o' conciseness).

I personally would love to see puzzles that shift slightly towards creativity and against process, towards induction and away from deduction, and so forth. Some examples:
'Brain teasers' such as the Green Glass Door or one of the many situational puzzles wherein the solvers attempt to divine what happened.
Puzzles to the tune of "The woman in the red hat dislikes the baseball fan; Mr. Jones disagrees" where the object is to match the person with the hat with the sport with the pet (for example). On a side note, I was toying with the idea of creating a type of puzzle like that specifically for you as a present, one that required knowledge of the gaming club members to succeed.

Riddles of nearly any type.

I imagine you may dislike these, since the first and third are strongly against the grain of what (I perceive) your preferences are. Still, you asked for opinions, so I thought I would post one.

In any event, I look forward to seeing the next puzzles.

Jim