There are two easy ways to complete this room; they are both symmetrical. Spoiler ahead:
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×For example, enter the room on the far right edge with your sword pointing Northwest.
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×Move diagonally Northeast until you are on the same row as the lower tunnel.
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×Move directly East onto the tunnel. You will be killing roaches with each step, and once you step onto the tunnel (but don't use it) you can QW and kill them all.
Game on,
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"
He who is certain he knows the ending of things when he is only beginning them is either extremely wise or extremely foolish; no matter which is true, he is certainly an
unhappy man, for he has put a knife in the heart of wonder."
-- Tad Williams