Numpad Hero was created with Unity. This allowed me to test not only on PC but also on mobile devices. If played on a phone or tablet the tiles on the screen are touched directly instead of pressing buttons. For devices without a numpad one can just use a 3x3 setup on the letter keys of your keyboard.
As the song progresses, targets appear on the screen on top of the tiles and a small black bar is moving up and down. If the bar hits the center of the target, the corresponding key must be pressed. One of the main things I took away from creating this game was how to let everything that happens base on the current position of the song. I definitely see potential to make a full game out of this and I hope I will find time someday to develop it further.
If you want to try it, you can play it directly in your browser or download the Windows and Android versions on itch.io.