Not the best Space Invaders clone. Your ship behaves like a cursor in a text editor - when you hold the arrow key, it first makes one step, and only then starts moving faster. Your bullets can't pass between the aliens. Which was the main source of frustration in the original. Overall, the game seems unpolished. You should be able to find a better clone, even if you must play it in the terminal.
Its Great playing in the Terminal, but its a slow moving.