Update 1
Last night I had guests for dinner, lots of lasagna and wine and the Compo started at 3am! Tried to have a little sleep before starting, with no great success. The theme was one of my least favorite and the first hour a drag. No ideas, not feeling it nor well. I went to sleep with the battle of jericho in mind, the music was an unconventional weapon to fell the walls. Though no ideas for game mechanics that I liked.
Woke up with a better (in the sense I like it better) idea : a puzzle game where sound is your weapon to solve it. I am thinking something like a minesweeper with sound clues. It is simple enough and I am excited by the prospect 
Let’s go : the source code will/is here :
https://github.com/GameDhim/ld32
the game will/is available here :
https://ld32.herokuapp.com/