Alright, I'll make a note of it. I'll probably have to recode the options menu to accommodate any extra options, so it might take me a bit of time. I'll put it on my to-do list and I’ll see if I can get around to it during the next couple of weeks.
Once again, I'm sorry for the inconvenience, and thank you for pointing this problem out! It’s appreciated!
The screen flickering is a commonly reported Ren'py issue which tends to happen on newer computers/laptops. I'm not 100% sure what causes it, but it's a problem with Ren'py itself, not the game.
If you encounter this issue with any other Ren'py VNs, you can check this post here for some advice on how to fix it.
I'm glad you enjoyed the VN other than that, though!