Having now played it (and loving it), I see WASD is included by default. Yay! I did find a pretty hefty bug-- I was placing floor tiles, and wanted to place one beneath the stairs-- silly, I know... but it covered the stairs down, and I then wasn't able to use that tile anymore.
And a smaller problem (or maybe intended), I can't pick up tiles after I place them.
Thanks for all your hard work!