Viewpoint 2064 is a cancelled shoot ‘em up that was in development for the Nintendo 64. The original Viewpoint was also an isometric shmup with an incredible difficulty released in 1992 by SNK for the Neo-Geo arcade platform. After Sammy published a port of the original game for the Playstation and Saturn, in 1998 they started to work on a true sequel for the Nintendo 64, that looked somehow similar to StarFox 64 (Lylat Wars).
True to its title, Viewpoint 2064 was going to have multiple points of view, with the classic isometric view and a “behind the spaceship” view. The game had a really good graphic for its time and it had a lot of potential to be a fun shooter, but sadly Sammy had some development problems and Viewpoint 64 was cancelled only a year after his presentation at the Space World 1999.
A playable prototype was found and sold on ebay in September 2015, you can see a video below that shows about 7 minutes from the game. It seems that this version of Viewpoint 2064 was almost finished as you can play all the level trough the end. There are multiple secret paths to discover that unlock different levels: there is a total of 15 areas but to finish the game you have play trough 5 of them, somehow similar to StarFox 64.