arrows and spacebar work, A and D don't, and so do the others
You are not in the game. You have to click into the game window so that your computer recognizes you're trying to play. It's in the description.
I read the description, I even played full screen and without it, and clicked many times both in and out of the game to "enter" the game again, but it didn't help
Try clicking on the player
Thanks, that helped fix it. I'll try playing further.