The Director's Cut of Deadlight was released last year, bringing new interest to Tequila Works' action game, and GOG's latest offer should do the same, as you can currently get this Director's Cut on their website for free, no strings attached.
Here's how GOG themselves describe the game: "A zombie outbreak eradicated all hope of returning life back to normal, now only survival lives on. Run, hide and fight your way through the undead as Randall searches for his family in this gorgeous, gritty, destroyed world." This involves environmental puzzles and difficult choices between sneaking past opponents or engaging in combat, as you won't always be blasting your way through enemies.
You'd best be quick if you want to snap this game up, though, as the offer will be over in a matter of hours, so there's every reason to pick it up if you have yet to try it. Has this got a space on your harddrive waiting for it?