Developer and VFX artist Osmany Gomez provided 20 minutes of gameplay for a fan game based on the 1989 Batman movie starring Michael Keaton and Jack Nicholson and directed by Tim Burton. In the video, the Gotham Knight travels through the cave, travels to Gotham in a Batmobile and meets the Joker.
The project looks very high quality and atmospheric. Gotham looks like a movie: very dark and gothic. There are no battles in the video, just Bruce exploring different locations. The demo is made on Unreal Engine 4 and looks very high quality. Of course, it does not hold up to the official games from Rocksteady, but it stands out from other works of enthusiasts.
Alas, it never comes out, but the developer uses it for their portfolio .