It was made in under 2 weeks. No game ever reaches its "ideal" form, but this one should get some keyboard and mouse and mapping improvements sooner or later (it's open source).
press the 'back' key enough times (x on keyboard, circle on ps4 controller) when not in map, alt+f4, task manager end task if on windows. Also in case you haven't figured out there is a pause menu from where you can save & quit