Here is a summary of the topics covered in the video, excluding any promotional content:

- The creator is on the lookout for new zombie games to play since they've played almost all available ones and asks for recommendations in the comments.
- They found a free zombie game on Steam called "Deathly Stillness," made by a single person, as noted in reviews and the game's description.
- The game features a variety of maps, including a dark mode, an unknown map that resembles "Backrooms," and a highway map.
- There's a character customization option with different clothing selections like jackets and cargo pants, reminiscent of a character in "Pitch Perfect."
- The game allows weapon selection and customization, specifically mentioning M416 and AK with changeable muzzles.
- The game impresses with high-quality graphics considering it's free, likened to "World War Z," which the creator also recorded playing before.
- There's no story-driven narrative; the objective is to clear the stage of zombies.
- The game offers an immersive experience with an atmospheric setting, not too realistic so that it remains game-like.
- Gameplay involves stealth elements, crouching, headshots, surprising zombie behavior, and a horde mechanic.
- The creator praises the game for details, graphics, sound, and ambiance, comparing it to "The Last of Us."
- The challenges include managing ammunition, facing different zombie types, navigating levels with several paths, and dealing with powerful boss-like zombies.
- The game mechanics include elements such as attracting zombies with noise (louder without a suppressor), dealing with hordes, and exploring environments including a village, dark alley, and Chinese-themed alley.
- The creator ends the session expressing high praise for the game, recommending it to viewers, and nostalgically comparing the experience to playing "Left 4 Dead" years ago.

The video concludes with the creator recommending the game as an enjoyable zombie game with a reminiscent feeling of "Left 4 Dead," mentioning that it's available for free on Steam and ending the session with a customary goodbye to the viewers.