The way I see it is as a prototype.Not that it's bad or anything but you need to work a little bit more.
1)Please, change the music/SFX because they are simply annoying (well, mainly the SFX)
2)Better graphics, although this isn't a must.I find it charming and to be honest, I don't care much about graphics but some people (zombies) might be put off
3)Improve the gameplay.Just get away from this flappy bird thing.I hate flappy bird and anything related to it (except flappy turd but that's a different story).Put the cat in a city and let him/her start on top of a building.Give me full control, allow me to enter buildings (or at least some of them) and maybe even add birds, mice and other critters for the cat to kill for more points.There are some many more possibilities with cats.Use your imagination.
That's all I can think of now but there's lots of room to grow.It's a lot of work and I know it but you don't need to steal other people's ideas...especially if they're bad.