From what I can see...
In the game's custom.exe, you can select the control setups "keyboard: left" and "keyboard: right." (The idea appears to have been that two people could play the game with a single keyboard, though on a laptop that probably isn't possible because of the lack of number pad.) The left player gets shift, Z, and X, and apparently T, F, H, and B for movement. The right player gets the bottom three arrow keys instead of shift, Z, and X, and presumably moves with the number pad (nothing I press will make the character move and since my keyboard doesn't have a number pad, I'm assuming that's what it is).
The movement controls would be pretty unusable as they are, but you should be able to remap them (using AutoHotkey or something similar) to more natural positions. i.e. have the left player use G for down instead of B.