Reddit reviews Brigador

Brigador is a truly excellent game, highly recommended as u/BW_Bird said if you liked Desert Strike and the others this is a deeper more fulfilling version, or mechs (there aren't enough good mech games these days), the lore is very well thought out and written (there's a pretty good military sci fi ebook based on it, I think you get that and the audio book version with deluxe package), the gameplay is pretty addictive and the devs are excellent at guilt tripping you into a purchase (jk they seem like lovely people)

Edit: It's still being updated as well (latest 6th Nov) and they seem to actually update the gog version at the same time as the Steam version, unlike some devs.

Edit 2: If you do buy it be aware that the meat of the game is in the Freelance/freeroam mode rather than the campaign. The campaign is really just a tutorial. The Freelance mode is where all the fun is to be had.

The audiobook comes bundled with the soundtrack as DLC for the base game (the first ever audiobook on Steam, apparently) but I don't think you can buy it as a standalone: http://store.steampowered.com/app/468280/

There is a Kindle version: https://www.amazon.com/Brigador-Bradley-Buckmaster-ebook/dp/B01G8UZZSW