On the character selection screen. You might need to click inside of the game, and use WASD to move between characters. Push “J” to select. Push “J” again to select the map.

Player1:
AD: move
S: Defense
J: attack /select
K: jumps
L: instantaneous step
U/I/O: key skills
P: modifier key

Player 2:
←→: move
↓: Defense
1: attack /select
2: jumps
3: instantaneous step
4/5/6: key skills
9: modifier key

Enter: Pause