A really good strategy on survival is to have the last row perfumes facing left and the first row flame blocks facing right. Leave one space after the flames and add a sticky sticky eye sticky sticky row. Immediately after that (with no space), add a row of right facing worms blocks. Then leave one space and add a right facing worm worm eye worm digestion. As the game progresses, replace the flame column with worms and add a digestion at the top of the perfume column. I got gold on survival first try with this strategy.
At the end, i reached a bug where customers at the end immediately got impatient as soon as they reached the register, even if they were the only ones in line.
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