Great game!
Reminds me a little of Robert Asprin's 'Dragon Poker' (from the novel 'Little Myth Marker' in his Myth series.)
I love the concept of playing a game vastly beyond one's ability to control it. But best of all, the devloper has managed to keep it fairly approachable and fun to play out different combinations!
The only issue I have is that this game plays more like a combination of Vingt-Et-Un and Blackjack (rather than strictly Blackjack).
I would offer a suggestion to the developer to encode and graph the various complications or system balancing will end up as an impossible task.