Fun game! Quick to jump in to, which is good, because I died a lot haha. I'm ashamed to admit that I had to drop the difficulty to easy in order to get a decent score :P Does the accuracy affect the score? I think the difficulty did give more points per kill on higher difficulties, is that right?
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The difficulty level simply makes enemies take 50% less or 50% more hits to destroy. The points are the same. However, points are scored for each hit and not just for destroying an enemy, so the Hard setting might actually score you more points just because you're doing more work, if you can survive.
Accuracy is just a stat for your own interest and doesn't affect score. It was just something I decided to do to add another fun element to the game.
Thank you for playing and commenting.