Collage.com Senior Product Manager interview questions

Actually had a good overall experience even though I didn’t get the position. I went to the final round of interviews, met with a PM, both founders and enjoyed our conversations. They are quick to respond until the last interview stage and represent a range of questions. My only negative feedback is that I was asked if I wanted feedback for my interview since I went through so many stages but it’s been 3 weeks of following up with them and still nothing. I’d like to know where I went wrong for future interviews.