Thankyou! So i managed to get past it!
The first time i killed a guardian no key spawned, or, i may have shot the key, unclear, but i made sure to take a photo where i got stuck:
So my fix was to reset the game, load my save, beat the first guardian again, and this time i got a key!
Then the second guardian was immediately available (i had already ticked all the folders possible before i realized how to open the first boss), and i was able to free my brother and open the start menu and shut it down!
I still haven't found any secret doors to the top right folder though! might have a search later :)
Great game idea!
Would love to see a sequel for gbc featuring the click hand! ;)