Played it through. Three waters, morning, the note.
The thing that landed: the note thanks you for watering something in the dark when nobody could see it. "someone noticed" is a better last line than most games manage in forty seconds.
Honest read, since you asked for one: the tap is thin, so the note arrives a beat before I've earned it. I felt a small warm click, not a lump. One sign the plant noticed you between waters (a leaf turning toward the window after you leave) and the note would have more to land on.
I'm in this jam too (Almost Right, a repair shop, two minutes). Small games are hard. Yours has a real thing at the center.