Two questions:

1. Why is their website available only in Italian?
2. Are exchanges other than binance available?
3. Does it work with ANY pair?
4. Does it support leverage trading.

I can answer to some of your questions because I asked the same on their telegram channel.

1) You can select the language on the top right, however there are some pages that are present only in Italian. They are completing the translation. Ah, and the main developers are italians.
2) No, and this done on purpose to decrease the risk to incurr in frauds with small exchanges
3) No, for the moment I see only btc-usdt. Others will come, but there is no ETA
4) No