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You can actually jump on monsters during your combo and it won't break it.
I found this out when I was playing and got four springs in a row, jumped on a monster (which boosted me further up), and allowed me to hit a final spring.
This is easily accomplished if you play the Jungle Level (perhaps each theme has certain sections that are unique to it) and reach nearly 20,000 points. You'll approach this section when you notice a single solid platform with a spring on it and nothing else on the screen (except maybe a few broken platforms).