Mostly safe, but public content is not curated, thus not supported by the staff's website. You're mostly on your own if you download apps/games from random people. VIP games/Staff-made games are top notch and 100% safe, though.
ATTENTION! It did look like a safe site at first, but I found their apps contain malicious codes to track our activities such as passwords and credit card info. Don't visit this site as it's highly dangerous, you've been warned!