I really enjoyed the atmosphere you created, the graphics have a unique style, which I believe gives the game a solid identity.
In the beginning, it was quite challenging to figure out how to proceed. I think one of the main things missing during the gameplay was clearer guidance on our objective and what we needed to do. Perhaps a short introduction level that introduces the objective and enemies would be enough to give players a general idea of the mechanics.
The music you used fits the atmosphere perfectly, that was another element I really liked.
I also felt a bit of a lack of scene variation, but I completely understand that time constraints likely played a part (my game faced a similar issue).
Lastly, a reset button or even the screen going dark until everything resets would be a great addition to make the game flow more smoothly when you lose.
Overall, great game, nice work, and best of luck in the jam!