I really enjoyed this! I agree that the first screen is the most difficult part. Despite reading your comment, I still had to check the walkthrough to understand how to leave the first room. A clearer hint in the note, something encouraging the player to investigate that particular wall—would help a lot.
The rest of the game communicates which objects to collect and where to use them very clearly, which is a great choice for a jam entry. It’s a solid point-and-click experience that tells a complete little story quickly and effectively. I especially liked the backgrounds and their visual consistency. I saw that you used a model fine-tuned specifically for the game, and the results are integrated very well. Even the relatively simple cutscenes look effective and fit the overall presentation.
Overall, this is a very strong and polished jam entry. Congratulations, great work!