The only nice thing I have to say about this game is that the scenes you get when you lose are great. Like actually more rewarding than if you win a level and get the animation. That is likely more personal taste, and my preference for the creators 2d art.
Other than that the controls are so user unfriendly it's painful. I don't know if this was originaly intended to be a web game or mobile, but it would really benefit from WASD movement and having the firing of the gun be automatic, because it's just a mandatory button to hold that adds no depth or purpose to the game other than to have lactic acid build up in your index finger at the moment.