The Epoch Super Cassette Vision has two controllers, each with two buttons, as well as a number keypad with numbers 0-9 and CL and EN buttons. In this browser-based version, use the number keypad on your keyboard to activate the keypad numbers. 0-9 match to the numbers on the keypad, Pressing the minus and plus keys on the keypad will match CL and EN.
Use the Arrow Keys for Player 1 directions, LEFT CONTROL for button 1, and ALT/OPTION for button 2. For the Player 2 controller, use R F D G for UP, DOWN, LEFT, and RIGHT, as well as A and S for button 1 and button 2.