Mars: War Logs brings to mind three particular games; Gothic, Deus Ex: Invisible War, and Dishonored. Mostly Gothic though.
The very first thing you need to do is check out the PCGaming Wiki entry on the game in order to address a few technical issues. Keybindings can only be changed by modifying the relevant configuration file, and the same is true for the refresh rate (which defaults to 100 for some bizarre reason) and field of view (the starting value allows you to see basically nothing).
The game itself resembles the Gothic/Risen games in combat style, leveling system, dialog, and plot developments while being structured a bit more like Invisible War. The Dishonored similarity is minor, with just the morality system bringing it to mind. It’s an… interesting combination that’s playable enough despite some exceptionally cringe-worthy aspects (such as the potential romance with a childlike and somewhat deranged half-naked abuse survivor), and though relatively short and heavy with backtracking ends up decent enough to justify buying on sale.