Seems as though breaking through the fence has to be the first priority, and of courses a fiver combined with a stripey accomplishes a lot - but so far not enough.
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At least this one has no chocolate, so once the fence is broken it seems like a good idea to save the powerups until they will be most effective..
Edit: By golly, I did it. WOW. I saved up the stripeys and bomb until I was near the bottom. Onward