Dennis Publishing interview questions

Stage 1 an informal chat with hiring manager, stage 2 a presentation Unfortunately I had to wait weeks for feedback. Usually this is absolutely fine however in this case the interview was difficult and it took a lot of time and effort for me to create the presentation. Going forward please can you get back to people, even if it's simply asking how the interview was or providing a timeline so applicants know roughly when they will hear from you.

The interview consists of 3 stages beginning with an initial screen with HR, followed by an interview with the hiring manager, and it ended with a 20-minute presentation based on the subscription marketing model. I haven't heard from them after the presentation even after a follow-up email - which looks like a usual practice judging from other comments on glassdoor.