Interesting take on Black Jack. I had a fun challenge playing.
Feedback:
The sounds for cards moving was nice.
Where were the special card abilities?
I liked the card animation when you left out of the how to play screen.
I wished there was sound with it and for the buttons.
I like the discard mechanic was great.
It is good that you can only discard until the dealer stands.
I had an incentive to win to get to a 50 score to see what was at the end, build off this.
I wish there was more than just the sound board when you got 50 score though.
For instance if the dealer wins then that could affect you next time around with your hand.
An example is to have a chance to receive a curse card which gives you a negative number instead of a positive one.
I wish there was an option to make the game's speed faster like in terms of the cards moving animation.
Overall, nice work!