Way to easy. Instead of a gun, a ballistic weapon like a bow would be cool or at least a way to shoot in different directions, so enemys could have areas where they could be hit and some where they couldn't be hit.

Very good start to a game here. Things to add more difficulty would make it more interesting!

May too easy. But otherwise its ok

I mean it is a good concept, but I feel like you add more implementation of the theme here beside just trying not to shoot the blue guys. Like maybe have green enemies who can mirror the player so that I am not spamming the shoot button. Or like something idk but you have good starter here.