Combination of skill and luck
So this game does rely on luck to a certain extent, with a good pretence. The combo bonus can enable you to get very high scores and the concept is great.
Perhaps you could make it 54 and throw a few jokers in there, with a slight tweak to the mechanics that a pair would mean the end of the combo, since 6 isn't higher than 6, nor is it any lower.
A good background, that might be complimented by the animation of a croupier's arm removing the cards from a shoe, perhaps with the face on show, so you could choose who deals, this would give the game more appeal.
Also, difficulty settings would be another way to add diversity to the game - more decks, so a much higher chance of drawing a matching card, but the chance of an exact match, which could give more points, as opposed to killing the chain would be a way forward.
Plenty of scope to take this game forward. Best of luck!
[Review Request Club]