You can't swing a severed limb around on the Play Store without hitting half a dozen zombie games, and first person shooters (even high-end variants like Unkilled) aren't exactly thin on the ground. But you might want to give Dead Effect 2, the sequel to a 2013 science fiction-horror shooter, a second look anyway. While the premise isn't exactly original, falling somewhere between Alien and Dead Space, the sheer variety and polish makes it worth consideration from Android gamers.
First of all, the game seems to have a much tighter focus on storytelling than other zombie shooters. You pick up right where the last game left off, on a derelict spaceship crawling with undead crewmembers and other, more elaborate monsters - think Doom 3 with iron sights. Second, there's an impressive variety to both the bad guys and the weapons you use to dispatch them. A combination of both pistols and long guns come in lead-slinging and laser-zapping flavors depending on which main character you're currently playing as. Oh, and there's a katana. Take a gander at the trailer below - you can chop up enemies into individual gory pieces, a feature that's pretty rare even in console games.
Oddly, Dead Effect has switched publishers for the sequel - the original game was published by BulkyPix, but developer BadFly Interactive is going it alone this time. (The first Dead Effect is now under BadFly's Play Store listing too.) Dead Effect 2 supports advanced graphics on NVIDIA's SHIELD devices, but it isn't a Tegra exclusive, and it's also compatible with external game controllers and Android TV. The game is free-to-play with in-app purchases going up to $100, so there's a good chance you'll hit a wall of grinding or unreasonable difficulty at some point.