I'm a fan of many of your games, and I've noticed most of them use single-button controls. In this setup, having Player 1 use right-hand keys aligns with most players' habits. However, once more buttons are required, the controls start to feel awkward. I believe most PC players still primarily use WASD for directional input. Perhaps you could merge both schemes – making both control methods simultaneously active in single-player mode. This would allow solo players to use more natural setups like WASD + JKL.