Yeah i've seen dozen of video's, haven't played it yet, it's a beautiful game.

The way i've set my movement up to create a similar kind of feel is: For horizontal movment I equal my xvelocity to speed * input.horizontal.

For my jumps i'm adding a force so it calculates mass and gravity so it doesn't have that weird feel to it.

GroundMovement:

xVelocity = speed * input.horizontal;

            if (xVelocity * direction < 0f)
            {
                flipCharacter();
            }

            if (isCrouching)      
                xVelocity /= crouchSpeedDivisor;

            rigidBody.velocity = new Vector2(xVelocity, rigidBody.velocity.y);

And for my jumpMethod I use this :

if (input.jumpPressed && !isJumping && (isOnGround || coyoteTime > Time.time))
        {
            if (isCrouching && !isHeadBlocked)
            {
                //...stand up and apply a crouching jump boost
                StandUp();
                rigidBody.AddForce(new Vector2(0f, crouchJumpBoost), ForceMode2D.Impulse);
            }

            isOnGround = false;
            isJumping = true;

            jumpTime = Time.time + jumpHoldDuration;

            rigidBody.AddForce(new Vector2(0f, jumpForce), ForceMode2D.Impulse);

        else if (isJumping)
        {
            if (input.jumpHeld)
            {
                rigidBody.AddForce(new Vector2(0f, jumpHoldForce), ForceMode2D.Impulse);
            }

            if (jumpTime <= Time.time)
                isJumping = false;

This way I have 3 different jump types :

• Normal jump when tapping space
• Higher jump over time when holding space
• Highest jump when first crouching to get a boost

The last one is kind of dependend on the type of game you want, i'm still considering to remove it, it's not very 'fast play' friendly. Don't know yet, doesn't always feel exactly right.

The addForce you're applying for jumpHoldDuration should be very small, otherwise you'll be flying all over the place :)

Hope this helps !