This is a very nice recreation of this game, i used to play this game over and over in browser at school.
The change you have made to the helicopter from the original seems strange though. The original has a green helicopter which sort of keeps with the background, i feel like maybe yours is a little out of place.
Some background music or helicopter sounds would also be really cool to add some depth to this.
Overall a fun game, i still have sat here playing it way longer than i should.