I quite liked this one!! I played all the way through and enjoyed the whole thing. I liked the shooting through portals idea. Only thing that jumped out at me is that you made the player ship blink when it got hit and that helps so much for the player to understand what's going on. I think if the enemy ships had some kind of visual feedback like that when they got hit, it would help and look even better. I thought you did a really good job on this!