Just what I was going to say. A mismatch between the film and the meter settings. The ASA tells the meter in the camera what sensitivity film you're using. Problem is, setting the meter to 400 and using 200 film would result in
underexposure, not over; the camera thinks you have more sensitive film and thus halves the exposure.
Is there any indication in the viewfinder of what the meter is doing? Do you see aperture and shutter indications? From what I can find about the camera, you have no manual control of exposure, it picks what it thinks will work, although it shows you the settings in the viewfinder, and if the needle is in the yellow area, it should expose well. Focus is weird, too, with four "zones" selectable on that front ring, or actual distance on the rear ring. That doesn't sound clumsy at all...
But first indication is that the meter doesn't work, or some internal setting doesn't work, because if you shot 200 film with the meter set at 400, your pictures should be dark.
I also read that light seals aren't very good on this camera... if these were the results I'd gotten, I'd write it off and bin it. Maybe keep it on a shelf with an "old cameras" display. Ten bucks down the tubes.