how to get stuck:
(i think it's the first room on the uppr right)
you know the room with 3 parallel floors?
an upper one with no spikes, middle one with short spikes and lowest one with many spikes?
yep, enter that room from the right.
drop key.
die in the spikes.
congratulations!
the key respawned on its spot on the left side of the room.
while you are on the right side.
spikes to the left sides which you cant cross without a key.
locked key door to the door.
yep, you softlocked the game :-)
and r will jsut respawn you at that spot, so it doesnt help either :-)