Kalimba is an old African instrument, also known as the African Thumb Piano in the west. Other names for Kalimba are mbira, ikembe, likembe, sanza, sansa, marimba, marimbula, while in the west it is also known as a finger harp or gourd piano.
The app runs in landscape mode (either side) and the instrument has 7 prongs, allows for multiple prongs to be pressed at the same time and also allows you to strum.
You can also change the tuning between C Major and G Major from the main screen.