Yeah.. this is 100% how I feel. And I know the rules, and remix culture ( as a vast majority of the things I make is remix culture, even my profile pics and stuff are repurposed edits )
I'm glad you explained all of this ( even though you didn't need to ) There's a stark contrast between stealing and fair use, and your game is clearly not a replacement or carbon copy of the assets you have edited in your own way.
What strikes me as odd, is I have this argument against literal asset flippers - liek on Steam; selling porn games and whatnot with literally stolen assets, art and so on...an nobody bats an eye ( except for me )
And then, creative works such as your dev team's here.. this is the literal face of remix culture at it's finest, and I love every second of it.
Your world reminds me of Crypt Worlds, which also uses some remix culture of it's own. And then, let;s not forget memes exist, and are literally a mascot to represent remix culture, and it's overlal effect on media.
anywho xD thanks, and liek I said before ; can't wait to see this game get finished ^^