Hey hey! Thanks for the in-depth feedback and praise. ❤️ We're happy you enjoyed the game.
We had a lot of trouble finding appropriate voice sound effects (we tried instruments, pen scribbles, stock voices...). What you hear in the game now are just bi's and ba sounds we recorded ourselves that play at a random offset and get a random pitch.
The lines where it gets high and short are originally lines where the general pitch of the voice becomes lower (for sad voices) or higher (for happy or scared voices). We're aware of an issue right now where the sound becomes insanely high pitched and super short on these lines if you play the game in certain browsers. (super confusing bug tbh 😀)
As for the other sound effects, I'm happy that you generally liked them! I'm not a sound designer by trade, and it was my first time trying to add 'realistic' sound effects to a game. I also think Tijmen's (great) music really helped. I'l definitely go in with a fresh ear and rebalance the sound a bit once the jam rating period is over. - Joran