First up, congratulations on completing the game jam.
While it was fairly short, it was quite a fun one to play. It felt complete with no bugs sticking out, which is great!
A couple things which could add to the gameplay would be if the player could stick to either keyboard or mouse for input. Tightening up the controls and adding a bit more forgiveness for the jump would come in handy too.
The mechanic of blasting enemies with a sound pulse was really interesting and might be cool to be able to use the sound pulse in different ways, like ricocheting off objects, or maybe using it to resonate, etc.
A background score and some simple animations for when the player dies, respawns, etc. could liven up the game a bit more, but pixel art can be quite time consuming to get right and I think you've done a pretty cracking job to begin with!
I hope you enjoyed making the game as much as I enjoyed playing it through to the end :)
Feel free to check out our game Reverb and let us know what you think!
https://itch.io/jam/pjp-game-jam-2023-1/rate/2079583