I like the idea and needed to check again the value of cards to get hold of it.
A thing which was not clear was how many cards per type are existing. I mean there is a five of a kind as winning hand, so it is different to a normal card game where you have only 4 of each (4 colors). But as there is a Five of a kind there are at least 5 and once I got even 6 Sheriffs on the table which made it unclear how many cards per type there are.
Additional design aspect would be to declare some boundaries so the character cannot get off screen (but this is just a design flaw).
Nevertheless good work - I enjoyed it.