Get Xenowerk, Space Marshals, Space Marshals 2, Halo Spartan Assault or Halo Spartan Strike instead. Like Neon Chrome, all five of those games are twin stick shooters, but all five of those games are vasty, vastly better in every way (fun, graphics, controls, setting, gameplay, enemy types, enemy variety, immersion, animations, solidity of combat, weapons, story (for Space Marshals 1 and 2)), presentation, and you can buy any three three of them for less than Neon Chrome costs all by itself. At 99 cents, Xenoworks is 10 times the game and ten times the fun Neon Chrome is, and it's 1/10th the cost. You can get both Halo games together for half the cost Neon Chrome is alone, and both are way, way better (the only thing the Halo games are missing is the ability to level up your character). I've played Xenowerk for hours and plan to play it more (it's a fantastic game that's an absolute steal for what they are charging); I've played Neon Chrome for about 30 minutes and had to force myself to keep playing after the first couple in the hope that it would get better (it didn't).
Xenowerk, both Halo games and both Space Marshal games also support external controllers as well. All five games have great touchscreen controls that felt better to me than Neon Chrome, but all five are even better with an external controller. Neon Chrome should at least support MFI controllers.