Inb4: Don't worry, I am focused on the target.
Pitch: Defcon but it is Earth vs Mars, The Expanse style, railguns/nukes/gravity slingshots.
@JanOrszulik Have you heard of the game Interplanetary? It feels like it has a similar vibe... https://store.steampowered.com/app/650220/Interplanetary_Enhanced_Edition/