Hmm ... I wasn't sure how to play it. I see you have the controls down in the description, that's fine, but many players tend to not read it. Might help to have some in-game inboarding. Maybe start the player in a safe zone so that they learn the mechanics one by one. Then introduce an enemy once the player familiarizes with the controls.
I found the WASD controls to be confusing. It seems you use the mouse to change your forward facing direction, where W is move forward, A/D strafe sideways, S to move backwards. I understand how it works now, but I don't think most players will get it at first. Maybe the mouse can just be for aiming, while WASD move the player.
I am digging the music. It is very appropriate for this kind of genre.