I've been tinkering with a very basic first-person raycasting engine in tic-80 in the past and I'm thinking of converting it to a grid-based topdown system for this jam. The end result might be more "weird roguelike" than "broughlike", but we'll see...
Viewing post in what language/system/software are you planning on using?
I used an earlier version of TIC-80 to create "The Sky House", it was a fun but at the time there was no way to write the code except from the editor which became a little bit of pain near the end (as there was a lot of code). I think they now support editing the tic file from any text editor. Also, they didn't have a full documentation about a lot of stuff :) But it was a really fun experience :)