Although the overall presentation is incredibly reminiscent of Metal Gear Solid, the gameplay has been heavily simplified. Most actions are handled automatically, with player input mostly limited to deciding where to move. There is strategy involved in sneaking past guards, making your way to objectives, and timing your combat strategies to enemy positions, of course, but for better or worse, all of it feels incredibly simplified.
The biggest place Never Stop Sneakin' differentiates from the formula is in its levels. Almost everything is procedurally generated here, which means no two games will play exactly the same. Procedural generation gives a nearly endless amount of variety in the way levels will be structured, which should increase replayability.
Never Stop Sneakin's appearance on the App Store should come as a surprise to absolutely no one. Dust: An Elysian Tail, The previous game from developer Humble Hearts, was a mobile exclusive years, and even on console, Never Stop Sneakin' looked and felt like something that would be right at home on mobile. Unsurprisingly, just like Dust, Never Stop Sneakin' runs great on iOS and has excellently-implemented Gamevice support.
If you're looking for a casual-friendly take on the Metal Gear Solid formula, this is as good as it gets on mobile.