Wow I absolutely adore this one! I somehow didn't notice it when first glancing over the jam submissions but I'm glad I looked over them again because this one was fantastic.
The pixel art is wonderful and I love how aggressive the monsters are, it makes the idea of making noise absolutely dreadful which is exactly how it should be so fantastic work on that!
You mention a need for level design tips so I will definitely say that the level design is limited by the lack of extra mechanics. Leaving the player with just movement controls and an obstacle avoid can only create so much variation. Consider adding new mechanics as the game progresses, a great example is how you added a throwable item towards the end, do more like that and just keep expanding until you find yourself with a complete game.
I think I have a new personal favorite of the one's I've played for this jam. I'm very excited to see your future work!