This Game Is just AWESOME, actually, I guess there are some actual bugs in the game, like some bosses include dead corners in which they can't shoot the player, on the other hand, the player could attack the boss and kill the boss. If I were to make this game, I would make the boss have buffs and extra shooters when they losses a certain amount of health. For the player, they could have other characters, and they can have different skills of benefit. And for the basic mobs, I think they should have less shooters, but the shooting speed should increase also, this would benefit the game and dominant the other versions and games, like this one. Last but not least, the basic mobs could include warriors that have fast movement, but instead of using ranged weapons, they should use melee weapons, such as swords.
sorry Anuke for only(mostly) talk about what should improve