Okay. The fact that the player character is controlled with WASD, using your left hand, and occupies the right side of the screen, while the AI character is controlled with the mouse, using your right hand, and occupies the left side of the screen takes the difficulty of this game up to 11. It's like the first time you tried rubbing your stomach and patting your head at the same time as a child. The simple switch of the AI doing combat and the player collecting coins would have made this much, much easier to get into. I don't hate the idea of forcing you to learn weird, difficult controls, but it felt out of place for an otherwise pretty straightforward little shmup kind of game.
Overall, really good work, but dang, this messed with my brain more than I expected it to. Lol.