Download of 8BitPiano 1.0 for Mac was on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The program lies within Audio & Video Tools, more precisely Music Production. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe. This free Mac app was originally created by ButtonBass.
From the developer:
With this application you can play on your device the songs of your favorite retrogrames. The application has an easy to use graphical interface that allows you to control the keys with your mouse or with your keyboard. You also have the option to see the keyboard letters or to hide them.
You may want to check out more software for Mac, such as Mandala Virtual Brain, Bouncy or SmallScreen, which might be similar to 8BitPiano.