Wow, it's a well-done game. "Hardcore vertical Flappy Bird?" :)
But honestly, there are so many additional mechanics, like different kinds of food to collect, gradually losing jump power, danger at the top and bottom of the screen, changing orientation.

On PC, if you use the mouse, I'd make right-click change the orientation, so you can play without using the keyboard at all.

Edit: Of course, you have my permission. There's no "copyright" for ideas and all reviewers mostly want to help you make the game better. So, yes, definitely; you're free to use any idea the review might have given/suggested to you.