12 years after the original release of DG2: Defense Grid 2, a first DLC has been released for the well-received Tower Defense game. Defense Grid 2 - Aftermath was originally released for Oculus Rift and Nintendo Switch but was never on Steam until now. Good to finally see it.
From the Steam page: "Defense Grid 2: Aftermath is the first official expansion to Defense Grid 2 - 10+ years after launch. Five advanced levels allow for great flexibility and creativity in tower placement and feature a new storyline with your favorite AI Fletcher. Protect the Cores on these advanced levels. Once installed, go to DG2's Campaign from the main Menu and continue onward to the added new chapter - found just to the right past Chapter 5. A new adventure for the Commander and Fletcher begins!"
See the original trailer below:

Direct Link
For fans of Tower Defense games, it's a good option to pick and has a Very Positive rating on Steam.
Game Highlights:
- A full story-driven campaign with 21 dynamic maps
- Online co-op and player-versus-player multiplayer
- Hundreds of replayable challenge mode variants
- Large, open-ended levels with multiple strategic solutions
- Steam Workshop support and powerful level creation tools
- Full voice localisation in Chinese, Korean, Spanish, English, French, and German
- Improved widescreen support, stability, and performance.
It did have Native Linux and macOS versions a number of years back, but official support for both was dropped in 2018. So you'll need Proton to play it.




How to setup OpenMW for modern Morrowind on Linux / SteamOS and Steam Deck
How to install Hollow Knight: Silksong mods on Linux, SteamOS and Steam Deck