At first, say yes or no to answer the question. Then press start and watch my wierd transition. If you typed yes, use (left right) arrow keys. If other than that, use your mouse (cursor). Dont shoot the hearts, as they will give you extra lives. The larger your score, the harder. the rainbow Triangles will give you more fire rate (shoot faster) and there is a boss every few 50 score. If you start the game and it does not show a start button, or ask you anything, press the green flag again.
My own brain. Thanks to google for the ship and the monster sprites.