The plot is short but somewhat interesting, as it deals with addiction and its side effects, a theme I haven't encountered in a visual novel (at least not for me, but there might be others out there).
However, I feel the theme isn't fully executed?
I think this is due to the short length, as the ending felt rushed, but the message you want to convey is clear.
If you plan to expand the story further, that would be great! As the brevity prevented me from fully connecting with the protagonist. Good work.