Thank you so much for playing! Sorry for the slow reply, I was also submitting to "Improve My Game Jam #9"!
In fact, because of the time I've take some of your feedback and included it in the next round of updates! I picked a new sprite font for the dialogue windows, and doubled the opacity of their backgrounds. I hope this improves the overall readability of the text. Additionally, I've added a new story into (tried to make it different that my usual stuff, but not sure if it was a good idea or not. There is a skip button, haha). There's also some additional story upon beating the boss.
If you do try it again, let me know what you think. Either way, thank you so much for playing, and especially for the feedback!