steeplechase/unity/Assets/DragonMovement.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class DragonMovement : MonoBehaviour
{
    [SerializeField] KeyCode FlapKey;
    Rigidbody2D _rigidbody;
    float _flapTime = 0f;
    [SerializeField] float FlapForce = 300f;
    [SerializeField] float FlapLength = .25f;

    void Start()
    {
        _rigidbody = this.GetComponent<Rigidbody2D>();
    }

    private void Update()
    {
        if (Input.GetKeyDown(FlapKey))
        {
            _flapTime = FlapLength;
        }
    }

    void FixedUpdate()
    {
        if (_flapTime > 0f)
        {
            _rigidbody.AddForce(new Vector2(0f, FlapForce));
        }
        _flapTime -= Time.deltaTime;

    }
}