Displaying one node for each unique field reference in View (e.g. one videogame for each developer)
UPDATE:

This unfortunately only works if your developers were users. After reading your question again, it appears you have created them as content, in which case my answer does not work.



Views has a built-in feature for this called 'Representative node'. This can be used to 


  Obtains a single representative node for each user, according to a
  chosen sort criterion.


So how to use this:


Start off by creating a view that lists users and add the Representative node relationship (in the advanced section).
Configure the selection criteria; in your case this would be 'Content: Authored on'.




This adds a relationship to Views, allowing you to add fields to the view.
If you want to show the rendered node instead of individual fields, add the Rendered entity field instead:



No need for aggregation.

Do note that this will always fetch the last node the user has created of every content type. You should add additional filters to the view to limit this to game-nodes, etc.