Great game! Got the boss down to 10 HP four times, but couldn't beat it in the end. I've loved grid based fighters like this ever since I got Megaman Battle Network as a kid, so this was a nice treat.
My feedback would be that the boss battle was a lot of fun to learn the patterns and try and have good enough reactions to win. In that case, every time I landed a shot, it felt like I worked for it and it was very satisfying.
But the levels against normal enemies were more like puzzles, which is fun too, but since it's not a "battle" in the same sense, I don't think they need to have as much HP as they did. In other words, shooting the enemy that just moves back and forth seven times is more tedious than satisfying.
So for a future release, I think low HP for the puzzle levels, and then the boss battle was so much fun, I'd love if there were more levels which are just fights like that. Anyway, great entry. Had lots of fun playing and will definitely be back to try and knock the last 10 HP from the boss.