I'm happy you made the birds split every so often, that really livened up the game. I think the auto gun caused me to lose points as I got too excited XD -- 59 is my high score. I also liked your instructions in pseudocode

great job! only somewhat unrelated to the game: i really liked your instructions, very clever. this is a great minimalist game and i think the combination of a semi-auto & automatic weapon in combination with a scoring system that penalizes missing the birds is a great touch.

I loved the simplicity. One problem for me is requiring  to use the arrow buttons instead of the WASD.

Interesting idea, I like it! It fits the theme well, but I do have one problem. For 99% of people, using the mouse with arrow keys is really awkward, most people use the mouse and WASD.