Hey suhwee,
Thanks for your interest in my little game.
You can customize your own layout (full game will also have a convenient menu to do just that). After starting the game for the 1st time (you can just quit out directly after via ESC), the game will create a "CustomControls.txt"-file in the main game folder. You can just edit that, it's pretty straightforward (pick the respective codes from the list and copy/paste them to the respective action, while retaining order of entries).
Mind that the game features diagonal tile movement, so playing with NumPad is really the optimal way, but in case you have to make do, sth. like WER/SDF/XCV might work for you ...