Could be better
Art and music are good, but the game is way to unbalanced and repetitive. One of the problems is the difficultly of the game. It's unrealistically hard. The biggest reason for that, imo, are the enemies who appear to close to the bottom of the map, becoming impossible to get while you're at the top of the screen - especially with the electric gates operating. If you can bring their spawning point higher that would help a lot to bring the game to manageable levels.