AVOXI Software Engineer interview questions

The initial interview with the hiring manager went well. The interviewer was friendly, kind and asked relevant questions. The interviewer assigned a take-home project with instructions that it should be completed in 4 hours. I completed the basic portions of the project but left a couple of the "bonus" portions with which I was unfamiliar. I spent about 8 hours on the work and knew it was unpolished, but definitely enough to show my skills and generate conversation. They gave me some very general feedback, but didn't schedule a second interview to discuss my work. IMHO, when a company asks you to spend any more than an hour on a demo project, they should at least give you a chance to discuss and defend your work. While they did give feedback, it was very general and I could have benefited from more details.