@Sergiocornaga: yes, there are flashes bestween screens
...but can you tell me more about these stupidly complex preventive measures? I'm interested!
Edit: Oh, I find a solution: In the level, you can choose the colors of the overlay (yellow-green, brown, ...) or no color at all. This is a good solution about the overlay/flashes screen: if the flashes are too annoying, you can select "grey/no overlay"