Our game is also a top-down one bullet shooter, though with a bit of a different gimmick - you have to pick it up to shoot it again. If you want to have a look: https://itch.io/jam/gmtk-2019/rate/462587
A bit more of a measured take on the one bullet shooter, but it has plenty of potential. Left a comment with some constructive criticism, and a rating. :)
