Heyy thank you for your detailed feedback and thoughts, For audio we actually didnt have enough time to implement it since we were focused on the skill tree and the loop logic most of the time throughout the jam, and for the lack of challenge, that can be easily fixed since i did make a wave generator, so i just have to tweak some variables for each enemy and how many of them can spawn on each waves, and it can get substaintially harder without much effort :P, i think after iteration 8 it starts to pick up the pace since all the enemies are finally allowed to spawn within the game.
Thank you again for this feedback, we will take it into considering when refining and polishing the game post jam!