How To Download Geometry Dash On Macbook Pro

Hello!! I am trying to use an apple bluetooth keyboard with my iPhone 7 for gaming (specifically geometry dash with computer controls), but it will not respond with the function. The "jump" keys are up arrow and spacebar. I tried pressing both of them, but it would respond to it. Can we see if we can get that function into the iPhone or if it already is a feature, how? Thank you!