To my surprise, UndyingNephalim has posted the 6th demo of his fangame, Star Fox: Event Horizon! I didn't even know he had released the 5th one. Both the 5th and 6th demos can be downloaded on his official ModDB page. The 5th demo added the ability to play in Aparoid crafts and featured a new Infestation Mode. The 6th demo adds a dozen new playable environments.
The video is an earlier showcase from September, showing off several Sauria locations, among others.
Thanks to Mr. Brownstone for the heads up.