I think it's cool to see this game revived but I also think it's kinda wrong to recreate a game that's not technically dead and plan on asking money to help before talking to the creator. Assuming you get that all situated though, I think a different engine would be better, especially if you're planning on adding more content and a tile-based map like you say. I know that's not easy, but maybe something like Godot would be better since it offers much more flexibility and it can still export to most platforms including web. Check out Broken Dreams Correctional Center which is made with it. Assuming good intentions though, best of luck!
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Totally get the concern. I actually did talk to Xadera already, and they were cool with me doing it. The only real ask was: don’t call it “a remake of Nimin,” because they’re working on their own remake and want that wording to point to theirs. So I renamed it and made sure it’s clearly its own standalone thing, with just a small credit blurb.
On engine: I looked at Godot, and I agree it’s powerful (especially for tile maps). But the learning curve is real, and for a systems-heavy game with tons of variables, Ren’Py + Python lets me move faster and keep the logic cleaner and less error-prone. When I add a bigger exploration layer, I’ll build it in a way that fits Ren’Py’s strengths, but I’m prioritizing a stable playable core first.