it’s my own janky engine that I slapped together for the Tic80 using a bunch of different things I read.
There's a lot of resources out there about writing a wolfenstein style raycasting engine. It just uses a bunch of math to draw the scene left to right. The height of the was is determined but its distance from the camera.
If you're interested in building one just google around a bit. Here's a link to one of the resources I used: https://lodev.org/cgtutor/raycasting.html
Sorry for the slow response, my email has been flagging itch emails as spam.