I loved the concept and had fun, but the issue is, easy mode is NOT easy, it's way too hard. Attack range is too short, and you should make it so you can press X to shoot instead of having to press the arrow keys with it just to shoot. That throws off the balance.
With these simple two fixes though, you have a really solid game. I played it on my livestream and just posted the video on my youtube channel and newgrounds post. :) I really like the concept and feels like old arcade games, it's a really fun game. I'd love to see a new updated version.