Simple arcade gameplay loop, it would be fun if there was an explosion when a duck gets shot! Sound effects would also help improve the feel of the game. I found the inputs to be somewhat unreliable, sometimes I would stop moving even though I was still holding down the arrow key. My last recommendation is to limit the time instead of bullets, it would be a lot more fun to try and get a high score since hitting the ducks accurately isn't very difficult. I hope you continue to make games! :)