I just made the base-assumption that anyone reading already knows how to clear the stage, since you wouldn't need this guide if you can't even complete each level, and thus they can just walk on it.
Unless there is a second setting to get the bug? In which case yeah I must have done it on accident and then I have no idea what the intended way is haha.
I'll have to experiment a little more on level 9 then, I haven't been able to find a reliable way to make it up the ramp other than mostly luck, though the times I did try it was pretty easy to get the bug if you're just patient since you're at a place where you still have time to dodge the ducks as they appear.