Thank you so much for the kind words!
You're absolutely right about the flashing. I actually added a warning at the beginning of the game mentioning the presence of flashes and fast movements, just to prevent problems for sensitive players.
I started working on this game quite a long time ago, and since I was rushing to finish it before Halloween (and didn't really have time or energy to add new graphics), I went for the quick solution of flashing the screen to simulate a "hit."
If I find the time in the future, I might replace the flash effect with something different.
Thanks for bringing this up. You've shown great sensitivity! You're helping me improve. I really appreciate it!