Yea, I've noticed these issues as well. See, I didn't have 10 days, I had 9, and some features I just didn't have the time to integrate, such as the explanation of the rules. The take button still being visible after beating cards is a strange error, despite all the code checking out. Indeed, highlighting the playable cards would help very much, but may ruin the immersion just a tad bit less... immersive.
As for the hand, it is worth noting that the world is ending in the game. In fact, I'm gonna go Mojang mode and make any visually altering bugs features. From now on the only correct explanation for visual glitches is: The world is breaking. :P
But hey, thanks for the feedback! I'll try to integrate these suggestions into the game after the jam is over.
Hahaha, right, I think that the world is ending scenario would be great to add. You can have the character talk a bit of some strange things that happens, so it's another reason to keep the player hooked to the game. Don't give the same story every time, but just give a random story at each game, so the casual player can still come back for just one game because is curious to know some of the weird things that are happening there.
Nice game, I am sure you can complete it nicely. Probably would be played as mobile app too, just make sure that cards are well distinguishable on the small screen. :-)