You definitely deserve 5 stars on the engagement section! Making us multitask is kind of a clever way to take all of the player's attention.
And for the blackjack part, I think you should change it with something equally thoughtful but not an established game. You see, not all knows how to play blackjack.. (I just randomly pressed hit and stand maybe?)
Overall, the color combination is super cheery. For the music, I think I have heard them before... Where did you get them? I'm interested to use them in future too...
Thanks for making this warioware ride!