Oh, that's *really* weird - I'd restarted once and it didn't help, but a second restart got it working! And I'm glad it did - what a wonderful game :) Thank you!
The game launches ok but the character constantly walks toward the camera. It's like the down arrow is constantly stuck on. Pressing up (or W) makes him walk away, and Shift works to start running, but I can't move left or right :(