isGrounded = colliders.Length > 1;

isGrounded = colliders.Length > 0;

Collider2D[] colliders = Physics2D.OverlapCircleAll(new Vector3(transform.position.x, transform.position.y-0.5f, transform.position.z), 0.3F);
isGrounded = colliders.Length > 0;

public Sprite sprite2;

void OnMouseDown()
    {
        var spr = GetComponent<SpriteRenderer>();
        spr.sprite = sprite2;
    }