Oh, that's right. I didn't know because I tested it by changing a the range of shooting when making it.
As you said, I think we need to balance it by changing the speed or adding another scoring system.
Thank you for your feedback.
I played it again and thought of a good idea to balance it, maybe. You could make the enemies spawning based on waves, for example, at some point it will spawn a lot of enemies on a straight line and you have to use maximum accuracy, and at another point it would spawn enemies all over the screen so you go maximum range.