Yes, it would be nice to have a category for puzzle houses.
The current leaderboard system encourages players to run through a house in 30 seconds and puzzle houses can't really be appreciated that way. It can be difficult to get them onto the leaderboard. Not sure there is a solution to that but if there were a separate category, at least players who are willing to put some time into touring would be able to find those houses.
I wonder if a broader category of "interactive" houses would be better, since there are also houses that aren't really puzzles but do provide an interactive experience.