Note: I never played this before.
It's a whole lot more fun than classic Space Invaders.
For one thing, it's not as difficult.
I notice the GBA version gives you the option of its version and the classic version played in.
I took one shot at the GBA version and played until I had a game over, starting from Pluto and reaching Mars.
I then play the classic version twice near the end of the video, starting at 33:49.