The team that made the excellent 2009 indie adventure game Machinarium, Amanita Design, has just released the first of three planned projects. This one is totally free but is less of a game and more of a very weird but enjoyable interactive music video called Osada.
The "game" is described as a "Czech psychedelic country music" video with interactive elements and Terry Gilliam-Monty Python style animation. There's flowers, men in sombreros and table tennis involved. It's very weird stuff and you can play it now via the Osada web site or you can download the "game" and play it offline.
Amanita Design has two more games in the works; the adventure game Botanicula and the long awaited sequel Samorost 3.