Sorry to hear that it's behaving badly for you. Happy to delete your account manually since we don't have any of that built in at the moment. Feel free to email me at george [at] stilllife [dot] studio with the email address.

Registration is useful for future features (like having an index of all your videos for example if you wanted to delete some of them)

Videos are supposed to get uploaded before hitting done to increase performance, but if it's crashing I'm not sure they uploaded succesfully.

If they are being uploaded show a progress bar immedietly. Make it obvious to the user what is happening. Magical applications that do things silently usually tend to fail silently in non obvious ways. At least with a graph you have a point of reference.