yea the SoundFx part was something i kept as low priority as i was trying to get most of the animations done, will definitely be adding that later on, and there was a music track added to the game, not sure why you couldn't hear it.
I will work on the empty slot part, maybe add 2 slots in each of the top empty room.
so the damage part was by design, there are 4 holes, each hole has upto 3 levels of damage, i set max to 2 for the Jam just to see how people would respond. visually the holes get bigger and the water flowing out increases, i should probably make the holes more obviously bigger, thanks for the feedback.