Wow, I love the look of the game, and the story behind it. I am a child of the 1980s Arcade Game Craze. The game makes me think of Galaxian and Phoenix...but on steroids or crack because you have the movement capabilities more like a Robotron. As for the sales flatlining - I might suggest that if you are making any profit on it at the normal sale price, leave it at the regular $2 price as what is shown, but keep it on sale all the time. People like to think they are getting a bargain, but also even at just $2 some may think your price point is too high and move past it. I wouldn't agree with it being too high, but for some it might be.
Best of luck with future sales!
Thanks for your comment :) Yeah, I grew up in the 80s too and despite all of the advances in graphics technology I still find myself returning to arcade and retro style games. I agree with you on the price. At this point, I've just accepted that "it is what it is" and am ready to move on. Thank you for reading.