Use the WASD keys or arrow keys to move! The box is the space you are confined in, dodge the cards. (This game gets progressively harder.) You get to hit the boss on every turn, and defeat the boss by getting its health to zero.
Credits from Undertale, Toby Fox, the inspiration from Undertale-themed games. This is still somewhat of a prototype, so let me know if there's any bugs. Also, you are able to change the number of card throws, albeit only up to 25 because of the difficulty when it is higher than 25.