Fantastic! Very slick, great concept, great execution. It really captures that elusive quality of addictiveness that makes for a great casual game. The one criticism I have from the start is the long screen of text at the beginning -- my eyes aren't what they used to be. I'd suggest extreme frugality with text (especially since the font itself is hard to read) and instead rely on some initial audio with options for player to quick reference any text pertaining to rules or nature of cards. I can see you are probably shooting for a retro look with the choice of font but it is just too much effort to read. I LOVE how you altered the cards and tweaked the standard Blackjack rules and the game is well balanced. Your choice of music is spot on too and the animation and the tweening -- it's all spot on. This is a game I will definitely support by purchasing on Steam.
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Not to argue with Marc's very valid experience, but I personally liked the wall of text because it instantly told me I was getting a story campaign along with my casual gameplay; it was part of what drew me in. (I also play games like this on mute a lot of the time, so audio wouldn't do much for me personally without a visual signal/text.)
Maybe you could look into options to change the font so it's larger and easier to read if necessary for people with vision impairment? And/or have it so just one paragraph at a time appears on the screen in larger font and you click to continue.