I'm in and stuff
I'm in. In the last two LDs I joined I used C and my own software rendering game engine, but it was not the most ideal option. This time, I will be using good old Html5 & Javascript. No WebGL, I don't want to run into incompatibility issues. Just plain Html5 canvas functions and Javascript (Typescript is a better language, but js is better for fast coding).
For art... GIMP, I guess. Nothing for audio, I don't usually have time for that anyway.
Here's the engine I've been programming for the LD: https://github.com/jani-nykanen/ld-engine It's a very minimal engine for lowres 2D pixelart games, but that's what I'm going to do anyway, so it's good enough.
And yes, I made one test game with it already. This one:

Play on itch.io (Yes, this is shameless advertising, what are you gonna do) It was supposed to be a warm-up game, but I ended up spending eight days making it...
I'm still planning to add a few more features to it, so maybe I'll make a proper warm-up game.