I'm not really a cards player, thus a little in game instruction would be great. Doesn't have to be a lot, a simple 2-3 screenshots which explains the mechanic in the beginning would be sufficient.
Viewing post in Kaputt jam comments
Firstly ofc the explanation you provided in the games description on the page. Maybe a bit less dense text wise and with describing pictures. Essentially anything that describes how the cards game works and what a possible strategy could look like.
From UI perspective i'm thinking like a first time welcome screen, which can also be called via help (?) button.