Very good job! The game looks really polished, and I love every detail that you had on it.
The issue, as other people had said, is controlling your character. Specifically aiming up/down, which I couldn’t totally get the grasp of. Also, I think that it would be best if you were able to use another key to shoot, instead of forcing to use the mouse. I think that using a mouse doesn’t make too much sense if you’re only using it as a button.
Aside from that, it was a solid game!