This 2 player game uses the theme in a pretty clever way: https://itch.io/jam/gmtk-2019/rate/461222
I also liked this arcade-style game a lot: https://itch.io/jam/gmtk-2019/rate/461348
I'm also going to stick to the general trend here and do a bit of self-promotion. I made a top-down zombie shooter where you only have one arrow to shoot and you only use one button to play: https://itch.io/jam/gmtk-2019/rate/462983
This was my first game jam, so I would really appreciate any feedback!