Vigil in a wilderness of webgames
At this point in the history of the web pretty much everyone with internet access will have played Insaniquarium. Lets face it, this nice little webgame has been publicised everywhere, the link has been been disseminated by timewasters worldwide... hell, I've even received unsolicited junk mail about Insaniquarium.
But I'd not played it before this week. If you're in the same sunken boat, and if you don't have a real-life alien-infested aquarium of your own, then give it a try. Way more compulsive than anything in life deserves to be.
Much less compulsive is Hapland, something a bit of a Samorost-alike but lacking in that essential little beauty's wonderful atmosphere. This sort of puzzle thing drives me mad, as I never like to be beaten by it, and I just keep clicking til my mouse contacts wear out. However this time I've given up before getting off it's first (only?) bleedin' screen, preferring to go swim with the fishies instead...