Mine: https://itch.io/jam/gmtk-2019/rate/460395
This is the one that stuck out to me when I looked back at the folder with like 40 games I've downloaded from this jam. I was quite surprised to see it only have 6 ratings so far (assuming the cache isn't outdated of course). It's not the game I've enjoyed the most, but I think it should have more than that.
Platformer Pong: https://itch.io/jam/gmtk-2019/rate/461223