Your game is very similar to mine in a lot of ways. Like mine it lacks polishing too, principally a tutorial. Principally your game neeeding understanding about card games to play aparently(thing that i don't have). I see you used some kind of API without editor(i did this too with Monogame), maybe this is the major cause for the raw state of your game(at last for me it was like this). You should try to re-do this with a more pratical engine, it really looks like something that would be good to play with better presenting.
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To be honest, I don't like "game engines". I think they're a waste of time. If you invest your time learning an actual programming language you got a real skill AND you can make games just as quickly as anybody else.
Also, I see a lot of people asking for a tutorial. I donno, I think that's a bit too much to ask for in a 48 hour game jam. And more importantly, I did this for fun, so I want to spend my time programming gameplay, designing maps, you know, the fun stuff. And I find that most people who come to play gamejam games are pretty tolerant of stuff like this.
Thanks for the feedback, I'll check your game out!