I found a few fun little Flash games recently that are really well-produced considering it's a lone garage developer putting them together. They're interactive horror adventures in the vein (pardon the pun) of Hellraiser and Evil Dead. The first one is called Exmortis, and the second, a sequel, is called Exmortis2 (found by way of Jay is Games).
The first game feels a little rough around the edges, and has a few game elements that it shouldn't, like having to do some events in an apparently arbitrary order. But it develops a surprisingly strong tone for its unique fictional world, which gets even stronger and more distinctive in the second installment. There are some good jump-scares in the game, rare for a Flash game, and it is fairly forgiving in the instant-death department, considering the subject matter.
I won't engage in spoilers here. Just go check out the games - be warned, though, they're not for the squeamish.