Excuse me but I was wondering if I can use the content from the marketplace such as the Shooter Sample to make my games with without modifying the things they come with? That way I can simply add my custom content like custom enemies but while keeping the things that it came with the same like the player character for example. Is this allowed or I misunderstood something because the last thing I want to do is something prohibited by the EULA.
Those projects and content count as “free content” in this quote from the official FAQ:
What can I do with this free content?
You can use template games to build and ship your own projects. We encourage you explore, deconstruct and modify the sample games and example content as you like. You can use this content for your own game projects, too!
I hope this helps to clarify!