bullet_interval = bullet_interval - 1
if bullet_interval <= 0 {
  bullet_interval = 100

  //敵弾生成
  repeat BLT_MAX
    if bulletStat(cnt) == 0 {
      bulletStat(cnt) = 1
      bulletX(cnt) = enemyX + ENY_SIZEX/2
      bulletY(cnt) = enemyY + ENY_SIZEY/2
      break
    }
  loop

}