This really shows promise to be much more than it currently is. It's unfortunate, as you say on the game page, that you didn't plan enough elements and implement them. Ironically the devlog is really well documented.
the art style itself is really well done. It's informative and clear and enemy status is really obvious when you get a hit. The controls are fluid, however, it really could do with an automatic switch from left to right if you want to fire on the opposite side instead of forcing the player to physically turn first.
Overall I'd be keen to see it developed much further on into a game with a storyline and more to do!