You know, it's funny you mentioned Wolfenstien as an inspiration. At one point, Wisdom Tree, (yes, the same studio that developed Bible Adventures,) licensed the Wolf 3D engine from Id, and also acquired a license to produce a video game based off the movie Hellraiser of all things! They were originally developing for the NES with plans to use a co-processor similar to the Super FX on SNES, but there were concerns over the cost to produce the cart, on top of issues getting the Wolf 3D engine to run properly. That, plus the fact Wisdom Tree had earned a reputation for developing Christian-themed games and a game like Hellraiser would've clashed with that image. (They were formerly Color Dreams, but I guess they couldn't revive that label.) So, WT would let the Hellraiser license expire, shift development to SNES and restart the project as Super 3D Noah's Ark.
Now fast forward over 2 decades later, and here comes an original raycast graphics game for NES running on stock hardware, (aside from using MMC3,) and it all runs fairly well aside from a fish-eye affect coming from a lack of distortion correction, but I don't know if that was a limitation. Whether or not this engine could be used to make a first-person shooter or some other type of action game, I don't know, but it's certainly impressive as it is.
The only other thing I have to say is: I'm no stranger to homebrew. You know the ROM, and so do I. An impressive demo's what I'm thinking of. I couldn't get this from any other guy!