That switch is used to turn off solar panels (that's what they are). It was rather proof of concept but that will be used in a modified form in final game. With explanation. In demo it is only useful in challenge mode - it is required to turn off at least one panel to open the door. During night door is open but flying robots are more aggressive.
In case you'rd lost, there are arrows on hand displays that help to navigate.
Yes, corridors will be longer and probably wider. I have to tune tile size automatically adjusted and expose few options.
Thanks for the info about the crashes :) there are few and I have some logs to go through and to fix bugs :)