I write these impressions as someone who's played the game on IOS and now a little on PC. Perhaps the closest analog to Breach & Clear would be Frozen Synapse's asynchronous turn-based tactical combat, with a dash of XCOM's classes and SOCOM's aesthetic.
Each mission places you in control of a small squad (each country has a small perk, i.e. SEALS have faster reactions). Your team consists of different classes, each with special abilities. For example the medic can heal a soldier or heal himself, the Fireteam Leader can draw all enemy fire to him, the Weapons Sergent can lay down suppressing fire, Intelligence can jam doors. As you level up, your troops unlock new abilities. Your weapons are equally customizable, from optics to grips to gas systems. Limited use gear like flash bangs and snake cams provide more strategic options.
Gameplay wise, Breach and Clear is all about the tactics. Place waypoints, aim line of sights, move to cover, cover your angles. Since enemy placement is randomized, you can never rely on one tactic for each level, instead always playing smart and considering how best to approach a room without leaving a blind spot that could bite you in the ♥♥♥. Don't do that, don't plan well, and your men will die. Your missions will take you across the globe, from Afghanistan and Russia to China and Germany, from simply taking down enemies to defusing bombs and reaching extraction points. Each requires you to play a bit different. The tactics to breaching a room is different than setting up to defend an area while defusing an explosive or moving to the extraction area.
While Frozen Synapse is certainly more complex, I actually prefer the realistic special ops aesthetic and the laser focus on close quarters combat and breaching compared to FS's sci-fi virtual style. And this isn't some crappy port either. The game runs silky smooth, the controls feel great, and the visuals have definitely gotten a nice upgrade. Setting up waypoints and firing angles feels even better with a mouse than touchscreen.
Visually it's not Crysis or Battlefield, but neither was Frozen Synapse. And Breach & Clear makes up for its visuals with cool little touches such as your troopers realistically leaning around cover to fire
I'd definitely recommend Breach & Clear if you enjoy tactical gameplay with a realistic edge.
Edit: PC additions include new weapons and maps, improved visuals, a permadeath setting, and probably some other stuff I'm not aware of
Will update the review once I've played more, tried out permadeath