I'll post more screenshots at some point, but here's my final score:
Keys, shown first player (second player):
w-a-s-d (u-h-j-k) are the up-left-down-right keys
v (o) will rotate, and select in the selection screens, and increment the continue? counter
b (p) will rotate, and cancel in the selection screens, and increment the continue? counter
Enter (Space) = select
command-R will reset the game and bring you back to the opening screen.
Note: There are second player keys, which, when hit during VS. Computer mode, will stop the current game and bring you to the VS. Player select screen.
If anyone is looking for instructions, I don't have them, but here's what I've figured out so far.
Options on the yellow screen, from left to right:
VS. Computer, VS. Human, Puzzle/Fever mode, Options
VS. Computer Menu: (assumed)
Basic/Training mode, Main/Story? mode, ? mode, Custom battle [edited]
VS. Human Menu:
?, ?, ?, Custom battle
?, ?, ?
Options Menu (from top to bottom):
?, ?, ?, Replay, ?Controllers, maybe?, Exit
After each battle, you'll be asked if you want to save the replay, and you can choose yes (left) or no(right).