EPILEPSY WARNING
Eastward comes with an epilepsy warning, and it's an important one. Many enemies emit a potent white flash when they are struck, letting the player know their attack was successful. On particularly large enemies, mostly certain bosses, this effect is especially jarring, uncomfortable, and potentially dangerous to people with epileptic tendencies, so please use caution and heed the warning.
There is a day 1 update (for Switch only?) that hopefully addresses this but it is NOT confirmed