I'm really impressed at how easily 404 sucked me right in! I found the introduction of the regulars to be really smooth (unlike some VNs that just force strangers onto you). Artwork is cute (dem nips be scandalous!) and I'm curious to see what the artist you guys found will do. :D The writing is natural, not cringy at all, and I can imagine real people saying the dialogue. I was able to laugh and feel sympathy all at once! Can really feel you guys' love for your characters.
The only thing that off-put me a little was the ringtone for the video call. It sounded to me like an unmemorable section of a track than what someone would put as a tone. But that's just me being a huuuuge nitpicker. :P
Truly though, please continue 404 as it's a fresh idea and the demo so far is full of potential!