I'm still working on removing the walls completely, they aren't supposed to be there at all. Just one of many things that ended up differently than in the Editor "post-build". I'm working my way through the bugs.
The player moves based on a NavMesh and is completely unaffected by walls. I assume the issue is that the NavMesh isn't baking properly because of some part of the procedural generation scripts that are not working as intended in the build. I did not encounter any of these issues in the Editor, so it's a bit difficult to test. I'll have some updates soon though that hopefully will fix it.
Thank you for playing!