This room is *tough*. That last bit took a lot of trial and error.
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×It's important to kill the last snake clockwise so you're heading towards the arrows
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×I achieved this by doubling back on myself after killing the 2nd from last snake
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×I didn't kill the snake in its entrance, but using the "steps" at the bottom up to the arrows
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×My last move before going onto the arrow had me stood to the left of the roach with the arrow NW of me
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×Moving NW then made the roach move up and burn
Hope that helps! It's possible to beat the timer by one move (if that's reassuring in any way
)