"Gameplay elements" refers to the specific features or mechanics that make up the interactive experience and actions within a video game, contributing to the overall gameplay and enjoyment. Full definition
The demo showed a wide variety of gameplay elements including gun play, stealth, the player gaining alien abilities, a crafting system, and a few other neat tricks. (provengamer.com)
I won't spoil it for you, but it could be a very, very interesting setting for the series and could breathe a ton of new gameplay elements into it. (playstationlifestyle.net)
We're also treated to glimpses of returning gameplay elements from the first game. (cultureofgaming.com)