Hey, I found out about the crossword game via twitter.
I've played it on English - Spanish and Chinese (Simplified) - English: the main thing I'm not figuring out is how to switch the direction of input using the keyboard. I've also tried playing English - Chinese, but it was way too annoying to scan through the entire bucket of characters to find the one I wanted; even input of accented letters in Spanish was baffling, and I gave up and clicked with the mouse.
Some of the translations are a little wonky ('thy' for ni3, which is mildly anachronistic; 'su' for ni3 men, which I would think would be 'sus'), but I guess that's how you know it's not hand-curated. I'd love it if Latin were available, but then you'd have to avoid http://languagelog.ldc.upenn.edu/nll/?p=14163.
But seriously, this is amazing. Where else can I get a Chinese - Spanish crossword? I think you'll make some weird-pair polyglots on the internet very happy.