First issue is that the name choice should note which is first and last.
Second issue if the right side UI doesn't have a scroll bar even if info goes off page.
Third issue is the left side UI has a width scroll bar even if it is maximized.
Fourth issue is the sound for each video is always on full volume, it should have an option setting in the left side UI to manage the volume for everything, look at apocalyptic world.
Fifth issue is spelling/grammar errors.
Sixth issue is not being able to define if there is something in a location at any time without going into it.
If you watch something with Ema it only has a continue watching action
Failed to load resource: net::ERR_FILE_NOT_FOUND undefined:1
Error: the passage "gym" does not exist (same with mall/teachers/friends/kira guide)
How separated all the movement is hurts the game flow.
Error: child tag <</link>> was found outside of a call to its parent macro <<link>> (computer)
Weird you can't shower in the second floor shower.
If events are in the the living room it stops the player from accessing the kitchen and aunt's rooms
Error: cannot find a closing tag for macro <<link>>
<<link "<<animeButton>>I can't study, I'm too tired<</animeButton>>" "bedroom">>… (18:00 study vanished)
Canteen black box is offset higher than others. Same with teacher's lounge.
studying with ema mc says he is too tired after a single study even if he has energy and time.
guide back button lacks the red.
(I would say to figure how you want the game to look from the start, a nicer looking game draws more people)
As mentioned by others the inability to continue Aunt's story because of getting quest 3 done early.