Use the keys W,A,S,D to move, Space to attack, aim with the mouse, and hold M to open the menu. You can change these controls in the settings in the menu, by clicking the button and then entering a letter of your choice (if you want to use the space bar, type space If you play for long enough, you can find the boss rooms.
Made for the Edulito Scratch coding competition (Entry by Mikey Howard, Wrenn School)