The presentation is the first thing that lands: the neon skyline, the card fan on the title, the board that lights up. It looks like a finished product rather than a jam build.
One thing you did that almost nobody in this jam does, and it deserves saying: the interface follows the browser language. I opened it twice, once with an en-US browser and once with fr-CA, and got Tutorial / Solo / Multiplayer and Tutoriel / Solo / Multijoueur, with the language button there to override. That is the right default.
One note from the tutorial: the explanation text clears on click, so clicking ahead a few times drops you on an empty 5x5 board with one card in hand, a 52 pile and a Discard slot, and nothing on screen saying what to do next. A hint line that stays until the move is made, or a continue button rather than a click anywhere, would catch the impatient.
Disclosure: automated headless pass at 1280x900, which is exactly why I clicked too fast. I am coming back to play a real solo run.
Ours is TORCH IT! if you want to swap.