I'm really annoyed honestly, because I can't really fault this. I guess I could say that the random bullet spawning patterns were annoying as all hell. Sure, the camera was too far forward and could've done with being a couple of units further back. Maybe the sound effects weren't juicy enough. I could argue that the difficulty was a little steep and the player's hitbox felt a little unforgiving (though that was probably BulletFury's fault...)
But really? None of those things matter. This is a damn good game, and I'd buy this.