Dementium 2 is a FPS developed by Renegade Kid and released for DS in 2010. Below we can see some screenshots and a video of a tech demo that was created before the actual development of the game started. Gregg Hargrove briefly talked about it in the Renegade Kid board:
I wanted to comment on how amazed I am that anyone was even able to find any info on the original “Village” demo that became D2. Wow!
I also wanted to give a shout out to the artist that helped me develop that demo, Erik McKenney, who sadly was not able to stay on with us past the demo. Times were crazy and we didn’t know where what was going to happen so we lost a great artist to a more stable company. D2 would have been that much better if we could have kept him on.