Thanks again. Here is a little more feedback and a request for a hint (slight spoiler):
FEEDBACK
1. I think it is important to tell the player upfront when the game starts about using capital letters as it both is important to Alice and the names of the paintings. Nowadays, it is my impression that almost everyone only type lower case in parser games because it is faster and works in most modern text adventures.
2. The pendulum clock cannot be referred to when the alarm clock is present so the player has to leave it somewhere before they can look at the pendulum clock.
3. You could consider if you can replace the "hidden" verb with a new or existing verb mentioned when typing "h". The problem is, that if just one verb is unknown it means that whenever the player is stuck they will try all sorts of verbs in a lot of different locations and they are never told if the verb is understood but not applicable in the situation. For instance, since the tray looks like a frisbee, I tried to "throw" the tray in all outdoor locations but my command was apparently not understood anywhere. So the player will use a lot of time trying verbs that don't work multiple times. In comparison, modern parsers will tell the player if a verb is understood, even when it is not applicable. Another popular modern branch is "limited parser" where all verbs are known. But as you allow for exactly one unknown verb, your game does not fall into that category which might make it harder to reach a wider audience. At least, when the parser is not limited, most players would expect smarter responses from the parser when a command is not understood. A solution could be to check if the player typed a verb which is not understood by the game, then you could respond "Sorry, I don't know that verb" or something but if the verb is understood but not applicable you could still say "You feel a bit confused." So if the player actually manage to guess an existing verb, then they can see they are on the right track.
HINT REQUEST (Mild spoiler):
I still haven't figured out what "bespectacled poppy" refers to so I really need a hint for that one.