i would like to rerelease your gameunder my gaming companys name give you credits using yours as a base if youd be willing
Like many of my games, this one has been partially open-sourced. You can use anything released with the source code or art pack under their respective licenses (MIT and CC-BY respectively). If you check out my OpenGameArt there are a few other art packs that are similar stylistically, also under CC-BY.
Using anything beyond those releases (ie assets ripped from the released game itself) is not okay. I also ask that you do not call your game Katana or anything similar. Do credit me, but do not misrepresent your derivative as being something I made rather than your own creation.
To be honest I don't know if I'd recommend working with this codebase. It's incomplete, poorly documented, and the code is ugly. I only used it once, for a section of RiftBreak, and then moved on to CommonCore, which mostly supports the same dialogue format and now has additional visual novel centric features (and marginally better documentation). You're probably best off just using something off the shelf, though, like Ren'Py.