A couple things I learned from making a board game with a trademarked name, in case it's relevant:
-IP laws are unique in different parts of the world, so it's worth checking what's "too close" in any market you want to sell in
-It's less about exact VS non-exact copies and more about the potential for confusing your product with someone else's IP. So retaining the nickname "Indy" might be arguable in isolation, but combined with your sprites, setting, story, etc, is it meaningfully distinct?
-Trademark owners often have a legal requirement to challenge every attempt at infringement, simply because if one person gets away with it, everyone else can use their success as precedent for their own infringement. So the closer to the original IP you stay, the more you can expect a letter.
This all really starts to matter if you charge for the game or trademark part of it. Hopefully this helps!
-IP laws are unique in different parts of the world, so it's worth checking what's "too close" in any market you want to sell in
-It's less about exact VS non-exact copies and more about the potential for confusing your product with someone else's IP. So retaining the nickname "Indy" might be arguable in isolation, but combined with your sprites, setting, story, etc, is it meaningfully distinct?
-Trademark owners often have a legal requirement to challenge every attempt at infringement, simply because if one person gets away with it, everyone else can use their success as precedent for their own infringement. So the closer to the original IP you stay, the more you can expect a letter.
This all really starts to matter if you charge for the game or trademark part of it. Hopefully this helps!