I don't think it is a good idea to tempt fate and throw yourself and everyone who'd be working on Neutopia 3 under the bus. "They can't bully me" is a crock. Yes they can. You're not in any position to defend yourself if they bring up a lawsuit. None of us are. We're dipshits doing this in our spare time. You lack the manpower and financial standing to go toe to toe with them in court. It'd be like bringing a nerf gun to a tactical nuke fight.
They can hose you down if you even
imply it's a Neutopia sequel. Change the name. Don't imply it's related to Neutopia in any way. Let the players imply it. It'll be everyones secret.
Golvellius and Neutopia got away with being released because they turned out to be different enough that suing them wouldn't do anything. Golvellius had all those sideways action scenes, Neutopia had well, way better features than Zelda did.. including USEFUL TALKING....
Giana Sister's got f*cked because of this:
See that grafitti? Yeah that's them saying "Hey look we ripped your shit off Nintendo, and now we're giving you the finger". Add in the barely different sprites and map layouts, and yep, you get hosed.
If you put this out as Neutopia 3, and say it's a sequel, you're asking to get f*cked.
Global Games Company got sued out of existence by Games Workshop for Legions of Steel and PlanetStorm being so similar to Space Hulk and Warhammer 40k, respectively.
Sure you may get publicity, and you may feel like they are being made a laughing stock for bullying you, but, who's going to get the last laugh when you're flailing around dealing with court fees and all of that shit? It sure as hell won't be you laughing, lol.
I'd just change the name and make sure you use from scratch artwork.