You can kill one of the gel babies right away. Then I killed the golem at
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×(24,16)
This allows you to keep the tar babies on the right side still while you strand a tar baby on
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×(18,16)
enabling you to go back to the right side and kill the last gel baby.
Even after following the proper steps, the briar and movement order are extremely fiddly in this room -- you may still end up with the final roach not getting killed by the briar unless you make exactly the right move sequence.
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34th Skywatcher
Best to PM me, since I might miss your message on CaravelNet chat.