Make a list of the features. Now sort it from easy to hard to complete including estimated time to complete. Figure out which features are need to be complete

Make a list of the features. Now sort it from easy to hard to complete including estimated time to complete. Figure out which features are need to be completed before other features. Now summarize that data in an easy to digest form, one method is to map it onto the calendar showing this is how long it is going to take to reach a point. Add the additional projects to the calendar. At this point, I'd schedule a meeting with the CEO and show him how much work there is to do based on the 16 hours 7 days a week that you are working. I'd ask him which items can slip to a later date when another item is added to the project or there is a new project. There are other solutions, but I'd keep it as non-confrontational as possible and show that you are wanting to accomplish the work.