Thanks for trying my game! I always include numpad so it surprised me that it didn't work for you. I gave it a try and movement is supported, but I found there is a bug with the Shift+Direction for numpad. That does make it unplayable. If you are really interested, I would be glad to fix it for you. Also, my latest game jam entry has numpad support, but sadly no warrior.
Sorry that I didn't have time to design the warrior into the game in the 7 days available. I was hoping the Rogue would be a good option for a melee character.