It's a must-have for people who like HMVs/PMVs, no question.
With how easy it is to create a quick playlist of what you want to "view" during a session, it is much more efficient to use this instead of clicking on each link and viewing it on your browser. It's simple to use, little laggy at the first load for videos (then it works pretty smoothly afterwards if you loop back!) and the developer is super receptive, listening to feedback from people in this very thread. Sites available are like r34.xxx, e621, so on, although the game allows for local files to be played (except for av1s but that's what HandBrake is for) so the possibilities are endless.
As what I can see on the Patreon, there's gonna be more content and ways for PMV/HMV editing, meaning this game is just going to get better and better. I'm giving it 5 stars just out of how much I'm using it now let alone as it improves. Some improvements to the game would be like an easier way to check the current queue (maybe with thumbnails, if possible?), and a countdown (which the dev seems to be working on alongside switching to favorite videos during the countdown, which is really cool!).
Very excited to see where this goes and how much it evolves over time.