Instructions: It's completely normal pong. Totally. Arrow keys or A and D to move the paddle, keep the ball off the bottom. Scroll down if stuck. If the buttons show up on your screen and you don't know what to do, hover over them and choose whichever one sounds better by clicking it.
Scroll down for comments cause it'll spoil the surprise if you see it too early. If you have any ideas for upgrades or downgrades I should add, put it in the comments below and I can try and put it in. Just remember not to make it too overpowered or too difficult.