There is a Download Demo button on the right side of the Steam page, underneath the game info and friend info. You can see this in the image above.
Dark And Darker is an FPS extraction shooter with Dark And Darker Gold some similar gameplay principles to Escape From Tarkov. Developed by Ironmace Games, it has been extremely successful on Steam, Twitch, and YouTube (over 1 million testers joined the December playtest.)
You take gear into each run, loot chests, defeat enemies, and try to safely extract with everything youve earned on the run. If you die, you lose everything. Once you have extracted you can sell your gear for gold at various merchants.
That gold can be used to purchase consumables or rare items from other players on the trading post. This may change in the future with solo dedicated playlists, although this has not been confirmed by the developer yet.
The game is slow-paced, very hardcore (you die in just a few hits), and extremely dark - as in, there are shadowy corners everywhere, often with any enemy Rogue in. Its a tricky game for solos and designed around party play at the moment.
The game is still currently in Alpha and its relatively early stages of cheap Dark And Darker Gold testing. Much more is planned for the game, including new maps, weapons, and more. Its success has been down to its emanation of other great games of a similar genre, but building upon those principles.