Press the button next to the play button to switch devices. Press punch to...well, punch and block to...well, block (Only for mobile Players). And click to punch and space to block for pc players. The enemy can dodge every now and then and they can also punch you back. If the enemy is flashing you should wait a little and THEN use your block (cause it has a recharge). Also when you lose press the green flag to play again.
This game is kinda buggy so if you see any bugs please put them down in the comments and I'll try and fix 'em. Also don't ask why they're boxing outdoors xD. I got the music from street fighter btw.