Fun game with great graphics. I like how challenging it is, and I think the mechanics of having your own bullets harm you is a cool concept. My only suggestion is that it might be nice if the player can rotate to shoot in any direction. This could be done by having the mouse control the player's rotation and clicking the mouse could cause the player to shoot. I feel like if 360 degree shooting was available, you'd also be able to spawn ghosts from any direction which would be interesting.