Hi there,
I made an app for count the score for each team.
My thunk skill not great,so if thats occur anything wrong.Please forgive.
App : https://x.thunkable.com/projects/5d43d8c375ccb5a4b2d81912/f4338804-08c1-4d91-81e2-ed108f989eeb/designer
You can remix it and make it stronger 
THANKS.
Update
- Now you can customize each player’s score colour.
- A new user interface is coming.