Really you can do whatever you want, no one will really stop you.
If you make a big fuss about the game and post it everywhere and email the creator you'll draw attention to yourself, just stay low key and make what you want to make.
If you're really really worried about lawyers, search the ags gen forum and there's a thread [or two] that talks about it somewhere in there...
But really, don't worry about it and just have fun doing whatever you want to do.
Unless it's a sequel to Grim Fandango.
If you make a big fuss about the game and post it everywhere and email the creator you'll draw attention to yourself, just stay low key and make what you want to make.
If you're really really worried about lawyers, search the ags gen forum and there's a thread [or two] that talks about it somewhere in there...
But really, don't worry about it and just have fun doing whatever you want to do.
Unless it's a sequel to Grim Fandango.