Amazing job on your first game jam, especially considering you done it solo. I definitely had a massive skill issue on the last level with the wall jump mechanic :D The visuals, music and sfx were put together wonderful. It had its own little cozy vibe. The wake up at the start was a neat little detail that I loved.
I don't really know what to suggest for improvements as the game feels great. Maybe work a little bit more on wall jump mechanic to make it more forgiving and easy but thats massively subjective. Maybe you achieved the mechanics that you intended.
Good job on the game!