Thanks! There should have been an in-game interactive tutorial to help players grasp the rules better, sorry it couldn't make it ^^'
(I'll add it after the jam)
About the JS, small anecdote: I use it because being a Web dev originally, this is the only language that I actively work with, so it's always fresh in my mind, instead of having to learn a new one that would only be used very rarely and probably very badly, making it more of a disadvantage during an already short jam!
(PHP too technically, but not going to use that for a game :v)