Oof, this one is rough! Communicating to the player what is happening is the game's weakest point: the story doesn't really give enough context to let me know what is going on or why I care, several battle mechanics are handed to me right away with no explanation, and it's not clear that I have accomplished the goal of defeating the green enemies when I did because they continue to fly around after their defeat - no text popup saying I did the thing, nothing in my inventory, nothing until I check the end door again and am told I can proceed.
I appreciate that you were trying to make a sci-fi game - which I respect and love the idea of - but the execution just wasn't there. I still appreciate that you entered and hope your future endeavors fair better.