Not sure how a dev can change fast-paced gameplay without seriously altering the nature of the game, but remappable controls should be the norm, and flashing lights have been known to cause issues for so damn long that it’s baffling that they keep doing it.
Unreadable text is something I know a bit about though. I’ve done some accessibility work for web UIs in the past and I can offer some guidance. Text should have good contrast with the background, said background should be static or even one solid color, text should be large and comfortable to read, and use normal fonts rather than dumb or fancy shit.