listenToKey.js

 _listenToKey(ev) {
    if (ev.code === 'Enter') {
      if (!this.state.running) {
        this._startGame()
      }
    }
    if (this.state.running) {
      if (ev.code === 'Space' || ev.code === 'ArrowUp') {
        this._controls.up++
      }
      if (ev.code === 'AltRight' || ev.code === 'ControlLeft' || ev.code === 'AltLeft' || ev.code === 'ControlRight' || ev.code === 'ArrowDown') {
        this._controls.down++
      }
      if (ev.code === 'ArrowRight') {
        this._controls.right++
      }
    }
  }