Oh so the TTS is actually just using the installed default voice on your windows machine, so install a better one :D ! It's mostly there for blind accessibility though! I'm part of the game dev community that makes blind accessible games.
I've used more advanced voices before and... yeah it's just VERY hard to do it in a short period of time. So I just used an accessibility DLL that I had used for previous projects that was good enough for some of my friends who aren't sighted can play as well.
And yeah some of them came out great, some not great, but they came out wonderfully for a jam I think.