I've known about the game for some time. Always wondered why no one tried to use anything from it here at ZFGC all these years(including myself).
Anways, I might arrange some tilesets, but I'll just link the maps from vgmaps:http://vgmaps.com/Atlas/SuperNES/index.htm#GunpleGunmansProof
It's a typical ASCII rip-off game(don't take it personally if you like the ASCII company). Either with or without Nintendo's help, it is a almost pure Link to the Past clone.
The tiles come pretty borderline as well.
The only thing that doesn't feel completely jacked is the spritework:https://www.spriters-resource.com/snes/ganpuru/
Some of it feels much more like a shitty kids' anime based on westerns.
Hope you guys find some usefullness from the maps!
If people want, I can arrange tilesets later.