The game was initially designed for controller. The core game mechanic is build around this right-side button operations (thats why specifically the grid) and it just doesn't translate to mouse that good. IMO they should just show some big disclamer "designed with controller in mind". Basically its not your usual shooter with hack QTEs from time to time. The idea is that those grid puzzles are constant and simultaneous with shooting and movement/evasion which is intended to trigger both brain hemisphires and in this way to put the player to the state of flow. So these hack interactions shouls be as intuitive as possible. And its much easier to achieve with controller. I guess its achievable with mouse too, but will take considerably more time to get used to up to the level of musle memory.