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Each potential section of wall is a separately drawn sprite, e.g. directly in front of you, two spaces away, or at a 90 degree angle to the right. The engine just determines which sprites to show depending on map position.

Obviously Dave has explained the fake-3D enviroment, but with regards to the weapons, it came down to Combat being the final big addition and they were supposed to feature accuracy differences  in exchange for big damage chances but hit-chance never got added in time, alas. It's certainly on my to-do list for a post-jam update, as well as redoing the station level to feel more coherent and room-based than winding corridors.

Glad you enjoyed it :)