Use arrow keys to change options, space to select, and space to continue to the next round. During your turn, you can press b to change your bet. This will change how much you bet the next round, not the current round.
This is a fully functioning 2 player blackjack. Please give any bugs or feedback in the comments. Notes (Most of these will be fixed eventually): Card designs are (obviously) placeholders. Insurance has not been implemented. There is only support for 2 players, up to 4 players may be added later.