Control Placement and Radius of Controls
When playing Frontier, I can't help but feel that this was mainly tested on the iPad. On the iPhone, the controls are cramped, and very small. I find my thumb landing right next to the accelerate/lean buttons constantly.
I play other many other speed running games on iOS, and they give players more control flexibility to avoid problems like this.
1. Allow the player to move the placement of the buttons in the options menu.
2. Increase the activation radius of each button. The radius of activation does not have to be the exact size of the virtual button. This would be a massive improvement to those of us with larger hands.
Both of these options would be ideal for everyone, because not everyone holds the phone the same/has the same size hands.