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To get full upgrades quicker (for the hard badge) don't upgrade everything one at a time. Buy the highest level, of ramp height for example, you can afford and save money for other stuff.
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upgrade everything. go on the 50 ramp. make your angle 3%. rocket to 175 mph. when you reach 150 mph rocket to 175 again. you'll get the meduim badge then. hope it helps, try and keep this comment alive.
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I can complete the game in less than an hour ! It's not Impossible ! I have completed it in less than an hour thrice now .