DECLARE A RIGIDBODY VARIABLE
IN THE START FUNTION SET IT TO : gameObject.GetComponent<rigidbody>();
THEN IN THE UPDATE OR FIXEDUPDATE DO AN IF STATEMENT WHICH CHECKS IF ITS RIGHT OR WHATEVER AND THEN DO
rigidbodyvariablename.addforce(new vector2 (0f,5f));
AND LEARN TO JUMP PROPERLY!
Otherwise this is literally the best game I've ever played, and I've played game of the year 420 blaze it so you know this is good.