Key placement seems to be working. Can't 100% guarantee at this point that
the key is being put into the room farthest from the boss, but it seems
like it's generally getting put far enough away that we're fine. Also
can't tell how badly it's impacting performance, but I'm pretty sure the
biggest bulk of loading time is spent placing blocks and shit. We'll want
to look into that ASAP methinks. Anyway, key is in the room - next up,
make the key pick-up-able, along with being placed into the inventory.
Guess I hadn't saved unity quite yet on that previous commit - sorry! Just
committing the saved scene file now.