So, I won't finish anything this jam, but it's been a valuable learning experience nonetheless. This time I wanted to experiment with tile-based graphics and shadow casting, and I've used some tools (Aseprite, Tiled, BoscaCeoil) for the first time. Also one of the first things I've done with Love2D.

Here's a GIF of the current (final) state, player-controllable entity in a room with walls, and what the player can't see is cast in shadows:

Also, a look at the debug view that allowed me to diagnose some bugs in my shadow casting logic:

Good luck to everyone!