I recommend adding a tutorial or explanation. I read the homepage, followed the funnel to "Play as Guest", and this immediately started a game with what was presumably another human. The prompts showed me how to play a card, but I'm not clear how the mechanics work.
I recommend that as well. I played as a guest and went on to have 2 victories while still having no idea what I was doing. The execution of the game is good though, feels very playable on a phone, if I knew how to play ;)
I tried to find a tutorial or rules page but could not find it. Tried the game but did not understand so much of it. I also made a card game, details in my profile.