Well, the thing is that what you've been doing is totally illegal. The question is not about licensing your game, but about licensing the stuff that you use in your game.
The Soundtrack was licensed to the game, Graphical Assets were bought from developers who hoped other devs would use them in their game, additional commissions were paid for, Additional music was added with permission, and from those musicians 2 tracks were remixed/altered versions of famous songs that had a good few thousand plays that SoundCloud seemed to not have had an issue with.
Additional artwork were fan art (or traces) of famous animes that were also used with permission. I don't understand why they may remix original content with no issues, but when i used (already altered) content by themselves with permission i may
buy a piece of rope and hang yourself.
The original question was if there was some kind of global license for all game developers that i might've not known about, the question is already answered.