Going back to the copyright stuff, I'll add my name to those saying Komani could totally sue the pants off Frozen Utopia over Neutopia 3. Is it likely? Maybe not, but it's one hell of a risk.
I'm no expert, but I've read a few books, registered a few copyrights, and I took a music business class, and as far as I can tell, you can claim Fair Use, or non-competition, or non-profit or point to your original code or anything you like, but the laws in this country come down to how good your lawyers are and you'll never be able to outspend a big corporation.
Corporations protect their assets. Period. Even semi-popular, abondonware video game franchises of questionable worth. No one worries about being a "laughing stock." Remember that media companies relentlessly sue the pants off of penniless, bit-torrent-pirating college students left and right, PR be damned. These days the corporations even go after the publishers, like wikileaks and megaupload and trying to pass laws to hold social networking sites accountable for whatever users post.
Random facts to consider...
* Negative Land was utterly ruined financially for years because they named an album "U2." They didn't rip off or parody any of U2's music or lyrics. They tried to justify the title with a prominent picture of the Russian "U2" spy plane on the cover, to no avail. They got f*cking hosed.
* There was a punk band called Assembly of God. They released small runs of 7" records on no-name, underground labels. The guys in the band were smart, well-read, educated, and as anti-authority and anti-religious as they come, but when they got a C&D from the church, they didn't try their luck, they changed their name the next week.
* Enix didn't even try to call their games "Dragon Quest" in the Eighties because TSR had a tabletop game of the same name.
* Wizards of the Coast/Hasbro owns tons of old P&P RPG settings and absolutely nobody has even gotten away with publishing any references to them. Gary Gygax could never again write make write about his Greyhawk setting after being driven from the company. Designer James M Ward started a little company in later years and had to destroy stock for making a single reference to his old character Drawmij - his name spelled backward! Heck, fans used to get hosed for even posting material online.