Hey! I like it! Very cool, and the layout was fine for me (IE10). If you want to swap plays for ratings, you could make it a minefield. Although it's a little long, I can't see people attempting it more than a couple of times before just giving up. I'd leave it as is, actually.
Only thing funny that happened to me was around row 12, column 12, there's a U9. I mistakenly went up 8 instead but hit a valid space. Then when I reached the end, I still had about a dozen spaces uncovered because I "jumped the line". Took me a minute and a bit of analysis to see what I did wrong. Nothing you can do about that, really, just an observation.
Great quiz!