A new demo for Nitro Family is expected to come out soon. According to this post, the developers accidentally uploaded a publisher test build of the game to the site for a day. This was mistaken for the demo. (oops).

Nitro Family is an FPS based on the Serious Sam game engine. The developer site quotes this about the game:

"Nitro Family" mainly focuses on images of the deepest desires of man like violence, sensuality and beauty, with a pure enjoyment of game. By embodying and mixing those images in non-serious way, players will experience a strange but bright and funny atmosphere like B-movies' unique taste with various of original gameplays which are never seen before in any FPS games. Nitro Family is powered by the world-renowned Serious Sam Engine.