User interface malfunction with keyboard+mouse set

Sometimes the user interface gets in the way of the function pointer available with keyboard+mouse set, resulting in protagonist firing in random direction. Otherwise, it could be some particular malfunction of keyboard+mouse of some other kind, also rooted in interference problem, such as movement direction and fire direction. Apart from that, if to move the pointer to the border of the screen, the window properties of the application on PC show up, simply invalidating any action in the game, which is an often problem with many application form games, making them still a technically inferior option.