I don't play many of these bullet-hell type of games, so I didn't quite know what to expect. It was a bit confusing at first that the guns were aiming at the mouse position on screen, which took a while to get used to.
However, after getting the hang of it this ended up being unexpectedly fun. The game loop is quite simple, but there's some depth to the game due to the amount of content.
I really like how everything is themed around the duck ("eggstra" gave me a good chuckle =).