I did it more or less the same way:
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×First I went along the top row, always "jumping" down once for the entrances to roaches lairs, then I killed the roach that came, and did the same for the bottom, except for tha lair in wich the roach was already dead, wich I just skipped.
Then I hit the token at the end, and killed the three roaches that came. After that I hit the top token, and killed the remaining two roaches, while going along the path that was left in a way that will drop all trapdoors.
-Insane