the easiest way to get the 50k jump is to get the monkey down to reaally low health, then do a massively long hang-glider (up to about 4000 x n) followed by every trick you can in a combo. After you kill him you should have about 29k points, if you haven't lost your groupies (thats the tricky bit) then it should be easy to get 50k: http://i41.tinypic.com/rhoadg.png
Nice one foggles B-) I would add different boulder types, and a faster-movement powerup would be cool. Nice idea though, its a good change from the standard get-hit-and-die model.
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