I use a PS5 controller, which functions perfectly on other games. In Rebuttal Showdown, you're supposed to be able to switch Truth Swords by holding L1 and moving the right stick up or down. In actuality, the right stick only responds if you hold L1 and also hold the left stick up while moving the right stick.

Also, in the bullet hell minigame, both noise bullets and mega bullets are fired with the Square button; if your mega bullet charges while you're holding down Square (firing noise bullets), the mega bullet is fired by releasing and pressing the square button. Since noise bullets and mega bullets are mapped to different keys on the keyboard, this definitely seems unintentional.

This is because the game is not primarily for controller, but we do minorly support it. We have heard complaints on controller controls for AA and we are considering addressing them. Sorry about that!