I really like the idea of a constantly-shifting hole you have to shoot through, but I feel like if it had smoother movement the game would be a lot more fun. My main issues is the fact that the character doesn't perfectly line up with the mouse and moves to it pretty slowly, and that the bullets are hard to see since they're grey or dark colored on a black or gray background.
Still a pretty alright game, though. definitely needs a lot more work.