Huh, haven't run into that problem before. Thanks for reporting it!
Are you using the number row on the left of your keyboard or the number pad on the right of your keyboard? Is NumLock on? I have no idea what Num Lock actually does but maybe it makes my game break?
I think the real problem is I was on Windows but I had accidentally left my keyboard on a Mac setting, so the key codes were different. Or something. I'm trying it on a Mac in Safari now and it works, but now there's no sound. The joys of making web games...
