Hmm, it should just be mouse for the menus and keyboard in-game. What isn't working? Do you have a qwerty keyboard or something else ?
I have a QWERTY keyboard. I tried the numbers on the top row, the numeric keypad, and then tried typing the numbers alphabetically (e.g., "five"). Nothing seemed to register a response in the game.
Damn, for the first level just typing the number should work. Must be something I screwed up in the input logic