Yesterday I played Mondi Confinanti’s “Little Falls”, a Glulx horror/thriller game. It’s short (less than an hour to play once), with few puzzles, largely relying on atmosphere; it provides full illustration and sound effects. I had mixed feelings — fuller review to follow — but I was impressed by the polish and effort, and probably would have found it more effective if I hadn’t gotten stuck on something stupid for quite a long time. If you enjoy horror or are interested in multimedia IF, it’s worth a look. There’s a page on the game and a download page.
A few weeks back, I played and enjoyed Jon Ingold’s “Dead Cities” from the Lovecraft Commonplace Book Project. I’ve yet to try anything else from that set, partly because “Dead Cities” was so cool I wanted to just let it stand on its own for a while. Wonderfully atmospheric, with some creepy, visionary elements.
Also worth a look: Eric Eve’s “Blighted Isle” (Zip file here). I beta-tested, so will not be reviewing it, and a few things may have changed since I tried it. But it is a sizable historical piece with multiple endings, a large host of characters, and the care and polish you would expect from Eve.