arrow keys, WASD, or mobile joystick to move, up arrow, mobile button, or W to jump, and down on the joystick, down arrow, or S to crouch. 0 to open the level editor and keys 1,2,3,4,5, and 9 to cycle through tiles, but pls don't edit level 1, since I spent a long time working on it. to switch levels, press the L key. When fire Mario, press x to shoot a fireball
Thanks to @griffpatch for the base tutorial and assets. Mobile code, lives, score, and end box item was my code.