I am truly impressed with your coding skills. The game feels and plays just like the classic, and the level of polish put into it is amazing. I see that a lot of effort went into this game with all of the little details.
It would have been great to see more of your own ideas and creativity implemented into the game. Maybe introducing new enemies or weapons that still fit the style of the original. Maybe a different scoring system that would force a different style of gameplay.
Overall, it is a great game and I enjoyed playing it.