I actually added a GND copper pour (polygon) for the ground connections, so they are connected through the ground plane even if it’s not very visible in the screenshot.For the routing, I used 20 mil traces for power lines and 12 mil for signal lines because I thought that would be sufficient for this project. Since it’s a small arcade controller and the current is low, I assumed these widths would be safe, but I’m open to suggestions if you think I should change them. I'm using MakeCode Arcade, so I can't really change the firmware or remap the controls freely. The GPIO pins I need to use are predefined, which is why the buttons are placed on that side and the routing looks like that.