Unfortunately it seems on itch io you can bypass the game page completely (specifically the description of the page where I included the information) however I also commented below with further information, I apologise for the incomplete state of the game, for simplicity's sake I'll paste it again here:
Controls
Player 1 / Player 2
Directions
W / UP
A / LEFT
S / DOWN
D / RIGHT
Punch one
J / NUMPAD 1
Punch two
U / NUMPAD 4
Kick one
K / NUMPAD 2
Kick two
I / NUMPAD 5
(attacks can be used whilst ducking, standing and in the air)