Are there any game submissions in this game jam that involves one person splitting into two or two people merging into one?

I'm interested in this game jam.

Yes. Thanks for reviewing my game. 

Not same as you are describing but in this game one player(user) controls both characters at the same time.

Check:-

https://itch.io/jam/united-game-jam-2020/rate/682774

Can you guys pls check my small game two brothers i need feedback thanks

thanks for all the suggestions

Check My Game. I Made Your Character Splits Into Two With Same Controls. You Need To Solve The Puzzles With 2 Controls. Your Goal Is Try To Put Together Your Spirits By Solving Puzzles. https://itch.io/jam/united-game-jam-2020/rate/683044