Visually, Scram Kitty and His Buddy on Rails reminds me of some of Sega's animal-centric games of the past. Particularly, Chu Chu Rocket. The game has a very slick presentation that rests comfortably between retro and modern, and it boasts an animated aesthetic that is reminiscent of a Saturday morning cartoon. The action on the screen is fast, furious, and colorful, and smart use of color patterns make it abundantly clear where Buddy should and should not go. Personally, I found it the perfect kind of game to play exclusively on the Wii U Gamepad; every time I tried to look at the TV screen, I'd get either intimidated by the size of the levels or distracted by the "newscast" that frequently pops up to give you advice or offer commentary on the carnage.
Scram Kitty and His Buddy on Rails sounds great, though you won't really be reflecting on the sound design at all while you're smashing your Wii U Gamepad against the ground in frustration. The synth-based soundtrack gets the job done, but won't win any awards. But really, it's perfect for a quick fix game like this. Shuttling along the rails sounds like it should, and the energy-based weapons Buddy uses sound fine. Get used to the "ow!" sound, though: you're going to hear quite a lot of it.