Click a binding, then press a key or mouse button. Esc cancels. The mouse always controls the camera and aiming.
The game is running: changes apply the next time the page is reloaded.
Save data lives in this browser's storage (IndexedDB) and survives reloads. Download a .gci to back it up or move it to another device, or import one to replace the current save. Imported saves load on the next launch.